[sage-support] Re: How to cimport a Sage extension class?
Hi Georg, On May 7, 8:21 pm, gsw wrote: > I ran into all these problems half a year ago Yes, I was surprised that it wasn't properly documented, although it looks like a pretty standard problem. > In the end Michael (Abshoff) got so > distracted from more important work, that I decided to let the topic > go for a while (see the history of trac #4857). And see the related/derived ticket #5990 Cheers, Simon --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: quotient poly ring and field
TO W. Stein: Thanks. That was what I needed. SAGE is a great piece of software. I'm using it in some adv math and cryptography classes. TO J. Palmieri: Yes I know you can do that. But you get into minor annoyances (which you can code around) such as E.points(). On 5/4/09, William Stein wrote: > > > On Mon, May 4, 2009 at 1:07 PM, gtg wrote: > > > > Hi I'm new to sage. Can you tell me how to construct finite fields > > using quotient of poly ring? For instance suppose I want to construct > > GF(5^2) using a GF(5) poly ring mod out by x^2 + x + 1 how do I do > > that? I can construct the quotient like this: > > > > p = 5 > > F = GF(p) > > R. = F['x'] > > f = x * x + x + 1 > > S = R.quotient(f, 'a') > > > > How do I force S to a field so that I can use it with elliptic curves? > > I know that I can simply do GF(5^2) but I want to be able to specify > > the modulus explicitly. > > Use the modulus option to GF: > > sage: p = 5 > sage: F = GF(p) > sage: R. = F['x'] > sage: S. = GF(p^2,modulus=x^2+x+1) > sage: S > Finite Field in a of size 5^2 > sage: a^2 + a + 1 > 0 > > sage: GF? # get more help! > > > > --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Weird(?) behavior of scipy.complex
Hi all. After importing scipy, if I run, say, scipy.complex128(1.0) or even scipy.complex128(1) I get (1+0j) , as I should. However, if I run scipy.complex128(1.0j) , I get this weird error: ---SNIP-- Traceback (most recent call last): File "", line 1, in File "/home/cf/.sage/sage_notebook/worksheets/cfantanas/4/code/ 235.py", line 7, in scipy.complex128(_sage_const_1p0j ) File "/home/cf/Code/APD/", line 1, in File "complex_number.pyx", line 879, in sage.rings.complex_number.ComplexNumber.__float__ (sage/rings/ complex_number.c:6201) TypeError: can't convert complex to float; use abs(z) SNIP I am NOT asking it to convert complex to float (at least, I don't think I do). I am running Sage 3.4 on 64-bit SuSE 11.1 with stock kernel 2.6.27.21-0.1, if that matters. TIA for your responses. --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Update R to the 2.9 release with milestone Sage 4.0
On May 7, 4:24 pm, Mike Hansen wrote: > On Thu, May 7, 2009 at 4:15 PM, mabshoff > > wrote: > > Thanks for dong this work so far. > > > Did you ever figure out if libintl was now mandatory? > > Wasn't it libiconv? Yep, just checked and you are right. But I did not check if 2.9 mandated it. > --Mike Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Update R to the 2.9 release with milestone Sage 4.0
On Thu, May 7, 2009 at 4:15 PM, mabshoff wrote: > Thanks for dong this work so far. > > Did you ever figure out if libintl was now mandatory? Wasn't it libiconv? --Mike --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Update R to the 2.9 release with milestone Sage 4.0
On May 6, 7:15 am, gerhard wrote: > FYI: Hi Gerhard, > I upgraded R to 2.9.0 on a Fedora 10 system: > Installation of the matrix package failed (incompatible library > issues) > > I recompiled all of sage to use gfortran > then, from a sage shell, ran This is a major problem, i.e. building additional packages for R per default needs to work with g95 (as well as g77 in the end). There are plans in Sage to remove at least for Linux the binary g95 and demand the presence of a system Fortran compiler as well as switch the default Fortran compiler for OSX to gfortran. Overall there are also some other issues with R, i.e. for binaries the likely move of the tree completely breaks R_HOME and causes all kinds of problems. I am interested in fixing all those issues post Sage 4.0 for which anything this large in scope like an R update are too late anyway. Thanks for dong this work so far. Did you ever figure out if libintl was now mandatory? Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: strange characters in notebook
On May 7, 6:05 am, gyro wrote: > Hi, > I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage > is compiled from source. > I am using the notebook interface through Firefox version 3.0.10 with > jsMath v3.6a. > > In the notebook interface, when I evaluate the contents of a cell, the > proper output is 'sandwiched' between sets of strange characters. > > I apologize for being ignorant as to what the characters are or > represent, but there are some square boxes containing '001B' and the > strings '[0m' and '[1;30m' repeated several times. This is usually an indicator of ASCII escape sequences. Any chance you have played with say custom IPython settings? > I have tried previous versions of both Sage (v3.3) and Firefox > (v3.0b5) and the problem is still there. > > Does anyone have any ideas as to what might be happening and how to > fix the problem? > > Thank you for any help you can offer. > > -gyro Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: strange characters in notebook
gyro wrote: > On May 7, 1:00 pm, Jason Grout wrote: >> gyro wrote: >>> On May 7, 9:27 am, Jason Grout wrote: Jason Grout wrote: > gyro wrote: >> Hi, >> I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage >> is compiled from source. >> I am using the notebook interface through Firefox version 3.0.10 with >> jsMath v3.6a. Sorry, I should really get more sleep. It appears that you saw this with a released version of Firefox. Can you point out a specific published worksheet (like on sagenb.org) on which you see this problem. If you can, a screenshot showing us exactly what you are seeing would be helpful too. Thanks, Jason >>> Hi Jason, >>> Using the same browser, when I create a worksheet and evaluate >>> expressions on sagenb.org, things look great. >> So have you only observed this on your notebook server? I'm not sure I >> can help more without being able to access a server that you see a >> problem on. Sorry. Can anyone else help? >> >> Jason >> >> -- >> Jason Grout > > I can only say that notebooks on sagenb.org look fine and those on my > server have the added characters. Unfortunately, I can't make the > server public, as my IT people won't even open up ssh to the outside > world. I understand. > > Thanks for your help and interest. > > I'll try a few more things and see if I can get things working > properly. It looks like it might be a unicode issue. The first thing you might try is upgrading to the latest release of Sage (3.4.2), if possible. I think there has been some recent work dealing with unicode and the notebook. Regardless, sagenb.org is running 3.4.2, I think, so there is at least hope that this would solve the issue. Jason -- Jason Grout --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: strange characters in notebook
On May 7, 1:00 pm, Jason Grout wrote: > gyro wrote: > > On May 7, 9:27 am, Jason Grout wrote: > >> Jason Grout wrote: > >>> gyro wrote: > Hi, > I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage > is compiled from source. > I am using the notebook interface through Firefox version 3.0.10 with > jsMath v3.6a. > >> Sorry, I should really get more sleep. It appears that you saw this > >> with a released version of Firefox. Can you point out a specific > >> published worksheet (like on sagenb.org) on which you see this problem. > >> If you can, a screenshot showing us exactly what you are seeing would > >> be helpful too. > > >> Thanks, > > >> Jason > > > Hi Jason, > > Using the same browser, when I create a worksheet and evaluate > > expressions on sagenb.org, things look great. > > So have you only observed this on your notebook server? I'm not sure I > can help more without being able to access a server that you see a > problem on. Sorry. Can anyone else help? > > Jason > > -- > Jason Grout I can only say that notebooks on sagenb.org look fine and those on my server have the added characters. Unfortunately, I can't make the server public, as my IT people won't even open up ssh to the outside world. Thanks for your help and interest. I'll try a few more things and see if I can get things working properly. -gyro --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Multi-thread and factor(n) problems
2009/5/7 Jérôme Tremblay : > > I have a problem using factor() in a thread. Consider the following: > > sage: class FactorThread(Thread): > : def run(self): > : factor(2^50-1) > : > sage: test = FactorThread() > sage: test.start() > > Exception in thread Thread-3: > Traceback (most recent call last): > File "/Library/Sage/3.4/local/lib/python/threading.py", line 486, in > __bootstrap_inner > self.run() > File "", line 3, in run > File "/Library/Sage/3.4/local/lib/python2.5/site-packages/sage/rings/ > arith.py", line 2027, in factor > int_=int_, debug_level=verbose, proof=proof), unit) > File "/Library/Sage/3.4/local/lib/python2.5/site-packages/sage/rings/ > arith.py", line 1849, in __factor_using_pari > prev = pari.get_debug_level() > File "gen.pyx", line 7871, in > sage.libs.pari.gen.PariInstance.get_debug_level (sage/libs/pari/gen.c: > 32133) > File "gen.pyx", line 7859, in > sage.libs.pari.gen.PariInstance.default (sage/libs/pari/gen.c:32038) > File "gen.pyx", line 9044, in sage.libs.pari.gen._pari_trap (sage/ > libs/pari/gen.c:38611) > PariError: (7) > > There seems to be a problem using pari in a new thread. > > Any suggestions? > Should I report this on SageTrac? > > Unfortunately, pari isn't thread safe and there's no reason that Sage's factor command (which is built on pari at present, though that should change soon) should be thread safe. I believe factor is being rewritten to not use pari, which may help. William --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Unexpected error during integration
I removed absolute value and tried indefinite integral
f(k,x)=exp(-(k))*exp(-I*2*pi*k*x)
print(integrate(f(k,x),k));
this gives some answer, now we can substitute limits,
R.
On 7 kvě, 19:27, Alan wrote:
> Hi,
>
> I am new to Sage and am trying to reproduce a well known result that
> the Fourier Transform of an exponential decay function is a Lorentzian
> function.
>
> In other words, the integral of
> exp(-abs(k)) * exp(-i2pi*k*x)
> with respect to k, from 0 to +infinity (i'm integrating 0 to +inf
> instead of -inf to +inf using symmetry),
> should yield a Lorentzian function as the result
> 1/(1+x^2)
>
> However, when I enter into my Sage notebook:
>
> k,x = var('k,x')
> f(k,x)=exp(-abs(k))*exp(-I*2*pi*k*x)
> integrate(f,k,0,Infinity)
>
> I get back this error:
> Traceback (click to the left for traceback)
> ...
> Computation failed due to a bug in Maxima -- NOTE: Maxima had to be
> restarted.
>
> If someone can help me understand what I might be doing incorrectly,
> that would be greatly appreciated!
>
> Thanks!
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[sage-support] Re: strange characters in notebook
gyro wrote: > On May 7, 9:27 am, Jason Grout wrote: >> Jason Grout wrote: >>> gyro wrote: Hi, I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage is compiled from source. I am using the notebook interface through Firefox version 3.0.10 with jsMath v3.6a. >> Sorry, I should really get more sleep. It appears that you saw this >> with a released version of Firefox. Can you point out a specific >> published worksheet (like on sagenb.org) on which you see this problem. >> If you can, a screenshot showing us exactly what you are seeing would >> be helpful too. >> >> Thanks, >> >> Jason > > > Hi Jason, > Using the same browser, when I create a worksheet and evaluate > expressions on sagenb.org, things look great. So have you only observed this on your notebook server? I'm not sure I can help more without being able to access a server that you see a problem on. Sorry. Can anyone else help? Jason -- Jason Grout --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Update R to the 2.9 release with milestone Sage 4.0
Gerhard, Thanks for your efforts! Roland On 6 mei, 16:15, gerhard wrote: > FYI: > > I upgraded R to 2.9.0 on a Fedora 10 system: > Installation of the matrix package failed (incompatible library > issues) > > I recompiled all of sage to use gfortran > then, from a sage shell, ran > > CPPFLAGS=-I"$SAGE_LOCAL"/include; export CPPFLAGS > LIBnn="lib"; export LIBnn > > export FC=sage_fortran > export F77=sage_fortran > > export SAGE_FORTRAN=/usr/bin/gfortran > export SAGE_FORTRAN_LIB=/usr/lib/ > > CFLAGS="-I$SAGE_LOCAL/include -L$SAGE_LOCAL/lib/ "$CFLAGS; export > CFLAGS > LDFLAGS="-L$SAGE_LOCAL/lib/ "$LDFLAGS; export LDFLAGS > > ./configure --prefix="$SAGE_LOCAL" --with-recommended-packages=yes -- > enable-R-shlib --with-x=$XSUPPORT --with-readline="$SAGE_LOCAL" --with- > blas="-L$SAGE_LOCAL/lib -lf77blas -latlas" --with-lapack="-L > $SAGE_LOCAL/lib -llapack -lcblas" $SUN_FLAGS > > make vignettes > make > make install > -- > cd rpy-1.0.3/ > RHOMES="$SAGE_LOCAL"/lib/R; export RHOMES > python setup.py install > -- > From R, I then installed the packages I normally use > without any further problems. > > -gerhard --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How to cimport a Sage extension class?
Crap. I ran into all these problems half a year ago (and solved most of them), but my attempt to document at least some of the findings did not take the right direction. In the end Michael (Abshoff) got so distracted from more important work, that I decided to let the topic go for a while (see the history of trac #4857). William, now that the Sage docs are all ReSTified, do you have something in mind what would best be done here down the road? Cheers, gsw On 7 Mai, 09:35, simon.k...@uni-jena.de wrote: > PS: > > > I tested which of these are needed for cimport of RingElement, and I > > found that SAGE_ROOT+'/local/include/csage/' suffices. > > I forgot to tell: > Plus SAGE_ROOT+"/devel/sage/", > > Cheers, > Simon --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: 3d tubes in SAGE
I didn't know the thickness parameter, but going the long route
(frenet frames), lets you do funky stuff like setting radius = 0.2*
(2+sin(6*x)), whereas thickness can be only a float.
Is there an easy way to render parametric_plot3d in Tachyon?
Rado
On May 7, 10:47 am, jason-s...@creativetrax.com wrote:
> Rado wrote:
> > Hello,
>
> > To test the 3D plotting abilities of sage, I tried to implement some
> > basic tube plotting like the ones here
> >http://facstaff.unca.edu/mcmcclur/java/LiveMathematica/tubes.html
> > (mathematica handles those beautifully).
>
> > The code is nice and short and I think the pretty picture that comes
> > out is good for SAGE posters or the show-off page in the wiki. To
> > compete with mathematica all that's left is putting nicer color
> > textures, but I don't know how to do that with JMOL.
>
> (CCing sage-support, since this seems like it would be of wider interest)
>
> This is nice! It's prettier than the shorter version:
>
> curve = vector([sin(3*x), sin(x)+2*sin(2*x), cos(x)-2*cos(2*x)])
> parametric_plot(list(curve), (x, 0, 2*pi),
> thickness=30,aspect_ratio=[1,1,1])
>
> Does anyone know why using the thickness keyword looks a little weird
> (like balls strung together, rather than a tube)?
>
> You can change the color by using the 'color' keyword. There are some
> predefined colors, or you can specify an RGB numeric list.
>
> curve = vector([sin(3*x), sin(x)+2*sin(2*x), cos(x)-2*cos(2*x)])
> parametric_plot(list(curve), (x, 0, 2*pi),
> thickness=30,aspect_ratio=[1,1,1], color='red')
>
> Incidentally, I think the function should be changed to accept vectors,
> so you don't have to put the "list" command in there to get it to plot.
>
>
>
> > #Original
> > idea:http://facstaff.unca.edu/mcmcclur/java/LiveMathematica/tubes.html
> > #SAGE translation: Radoslav Kirov
>
> > def vector_normalize(v):
> > return v/sqrt(v*v)
>
> > x,s = var('x,s')
> > curve = vector([sin(x), cos(x),0])
> > #if you are happy with the torus, try the trefoil knot
> > #curve = vector([sin(3*x), sin(x)+2*sin(2*x), cos(x)-2*cos(2*x)])
> > tangent = diff(curve,x)
> > unit_tangent = vector_normalize(tangent)
> > normal = diff(unit_tangent,x)
> > #alternative is to cross_product with a random vector. This might be
> > faster but will make picture uglier.
> > #you will probably, need to check that the tangent is not parallel to
> > [1,1,1].
> > #test_vector = vector([1,1,1])
> > #normal = (test_vector.cross_product(unit_tangent))
> > unit_normal = vector_normalize(normal)
> > unit_binormal = unit_normal.cross_product(unit_tangent)
> > radius = 0.3
> > parametric_plot3d(list(curve + radius * cos(s) * unit_normal + radius
> > * sin(s) * unit_binormal), (x,0,2*pi),(s,0,2*pi),aspect_ratio=[1,1,1])
>
> > Also, a warning for people who come from the world of Mathematica:
>
> > sage: v=Vector([2,1])
> > sage: v.normalize()
> > (1, 1/2)
>
> > I lost a good 15 min. on that. I am guessing this definition of
> > normalize comes from polynomials but its quite weird for regular
> > vector calculus.
>
> Ouch. That seems really out of place for vectors. I agree it ought to
> be changed.
>
> Thanks,
>
> Jason
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[sage-support] Unexpected error during integration
Hi,
I am new to Sage and am trying to reproduce a well known result that
the Fourier Transform of an exponential decay function is a Lorentzian
function.
In other words, the integral of
exp(-abs(k)) * exp(-i2pi*k*x)
with respect to k, from 0 to +infinity (i'm integrating 0 to +inf
instead of -inf to +inf using symmetry),
should yield a Lorentzian function as the result
1/(1+x^2)
However, when I enter into my Sage notebook:
k,x = var('k,x')
f(k,x)=exp(-abs(k))*exp(-I*2*pi*k*x)
integrate(f,k,0,Infinity)
I get back this error:
Traceback (click to the left for traceback)
...
Computation failed due to a bug in Maxima -- NOTE: Maxima had to be
restarted.
If someone can help me understand what I might be doing incorrectly,
that would be greatly appreciated!
Thanks!
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[sage-support] Re: strange characters in notebook
On May 7, 9:27 am, Jason Grout wrote: > Jason Grout wrote: > > gyro wrote: > >> Hi, > >> I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage > >> is compiled from source. > >> I am using the notebook interface through Firefox version 3.0.10 with > >> jsMath v3.6a. > > Sorry, I should really get more sleep. It appears that you saw this > with a released version of Firefox. Can you point out a specific > published worksheet (like on sagenb.org) on which you see this problem. > If you can, a screenshot showing us exactly what you are seeing would > be helpful too. > > Thanks, > > Jason Hi Jason, Using the same browser, when I create a worksheet and evaluate expressions on sagenb.org, things look great. Regarding the screenshot, I am reading this newsgroup through the google groups webpage and can't include any attachments, nor can I add the image to the file section of this group. So, I uploaded the screenshot to a free picture hosting group: http://tinypic.com/view.php?pic=6qgmjp&s=5 (Sorry, I don't know any other way to let you view the image; any hints are appreciated) Thanks again for your help. -gyro --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: parametric_plot3d appears to not give the correct axes values, also steals keyboard
thanks! On May 6, 11:33 pm, William Cauchois wrote: > I filed a ticket athttp://trac.sagemath.org/sage_trac/ticket/6002. > > -- Bill --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: [sage-edu] 3d tubes in SAGE
Rado wrote:
> Hello,
>
> To test the 3D plotting abilities of sage, I tried to implement some
> basic tube plotting like the ones here
> http://facstaff.unca.edu/mcmcclur/java/LiveMathematica/tubes.html
> (mathematica handles those beautifully).
>
> The code is nice and short and I think the pretty picture that comes
> out is good for SAGE posters or the show-off page in the wiki. To
> compete with mathematica all that's left is putting nicer color
> textures, but I don't know how to do that with JMOL.
>
(CCing sage-support, since this seems like it would be of wider interest)
This is nice! It's prettier than the shorter version:
curve = vector([sin(3*x), sin(x)+2*sin(2*x), cos(x)-2*cos(2*x)])
parametric_plot(list(curve), (x, 0, 2*pi),
thickness=30,aspect_ratio=[1,1,1])
Does anyone know why using the thickness keyword looks a little weird
(like balls strung together, rather than a tube)?
You can change the color by using the 'color' keyword. There are some
predefined colors, or you can specify an RGB numeric list.
curve = vector([sin(3*x), sin(x)+2*sin(2*x), cos(x)-2*cos(2*x)])
parametric_plot(list(curve), (x, 0, 2*pi),
thickness=30,aspect_ratio=[1,1,1], color='red')
Incidentally, I think the function should be changed to accept vectors,
so you don't have to put the "list" command in there to get it to plot.
> #Original idea:
> http://facstaff.unca.edu/mcmcclur/java/LiveMathematica/tubes.html
> #SAGE translation: Radoslav Kirov
>
> def vector_normalize(v):
> return v/sqrt(v*v)
>
> x,s = var('x,s')
> curve = vector([sin(x), cos(x),0])
> #if you are happy with the torus, try the trefoil knot
> #curve = vector([sin(3*x), sin(x)+2*sin(2*x), cos(x)-2*cos(2*x)])
> tangent = diff(curve,x)
> unit_tangent = vector_normalize(tangent)
> normal = diff(unit_tangent,x)
> #alternative is to cross_product with a random vector. This might be
> faster but will make picture uglier.
> #you will probably, need to check that the tangent is not parallel to
> [1,1,1].
> #test_vector = vector([1,1,1])
> #normal = (test_vector.cross_product(unit_tangent))
> unit_normal = vector_normalize(normal)
> unit_binormal = unit_normal.cross_product(unit_tangent)
> radius = 0.3
> parametric_plot3d(list(curve + radius * cos(s) * unit_normal + radius
> * sin(s) * unit_binormal), (x,0,2*pi),(s,0,2*pi),aspect_ratio=[1,1,1])
>
> Also, a warning for people who come from the world of Mathematica:
>
> sage: v=Vector([2,1])
> sage: v.normalize()
> (1, 1/2)
>
> I lost a good 15 min. on that. I am guessing this definition of
> normalize comes from polynomials but its quite weird for regular
> vector calculus.
>
>
Ouch. That seems really out of place for vectors. I agree it ought to
be changed.
Thanks,
Jason
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[sage-support] Re: Sage for Scientific Grid
William Stein пишет: > On Wed, May 6, 2009 at 6:43 PM, Serge A. Salamanka wrote: >> Hi all, >> >> To start with I'd like to describe my ideas about gridification of Sage. >> >> This task is a very common one nowadays but it is a challenge for me. >> >> The very first thing I'm asking myself is how to simplify this >> gridification. >> There are lots of tools that can be used at the moment and that is why >> the biggest question comes in mind: which one to use ? >> >> >> ... read further here: >> >> http://sageworldmath.blogspot.com/2009/05/sage-for-scientific-grid.html >> >> >> >> May be someone already has experience of enabling applications for Grid ? >> > > What are you trying to compute? > > William > I'm trying to provide my colleagues from HEP with an alternative, free and sufficient computer algebra system that will also utilize Grid functionality. They all use Mathematica. There is an interest in GridMathematica but it is not available at all (due to its cost and very controlled distribution). I used it a lot but when I have to build a knowledge base on that expensive system, I always feel that some day it will be waisted at all. So I'd rather be on the hard way rather then someday come to a dead end. Computations can be of any sort... ... when you have > 3000 CPUs # Serge > > > --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: strange characters in notebook
Jason Grout wrote: > gyro wrote: >> Hi, >> I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage >> is compiled from source. >> I am using the notebook interface through Firefox version 3.0.10 with >> jsMath v3.6a. Sorry, I should really get more sleep. It appears that you saw this with a released version of Firefox. Can you point out a specific published worksheet (like on sagenb.org) on which you see this problem. If you can, a screenshot showing us exactly what you are seeing would be helpful too. Thanks, Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: strange characters in notebook
gyro wrote: > Hi, > I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage > is compiled from source. > I am using the notebook interface through Firefox version 3.0.10 with > jsMath v3.6a. > > In the notebook interface, when I evaluate the contents of a cell, the > proper output is 'sandwiched' between sets of strange characters. > > I apologize for being ignorant as to what the characters are or > represent, but there are some square boxes containing '001B' and the > strings '[0m' and '[1;30m' repeated several times. > > I have tried previous versions of both Sage (v3.3) and Firefox > (v3.0b5) and the problem is still there. > > Does anyone have any ideas as to what might be happening and how to > fix the problem? You're using a beta version of Firefox? Try using an official release. Apparently there have been problems with some beta versions and fonts, which affected jsmath displaying nice typeset mathematics. Jason --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Multi-thread and factor(n) problems
I have a problem using factor() in a thread. Consider the following: sage: class FactorThread(Thread): : def run(self): : factor(2^50-1) : sage: test = FactorThread() sage: test.start() Exception in thread Thread-3: Traceback (most recent call last): File "/Library/Sage/3.4/local/lib/python/threading.py", line 486, in __bootstrap_inner self.run() File "", line 3, in run File "/Library/Sage/3.4/local/lib/python2.5/site-packages/sage/rings/ arith.py", line 2027, in factor int_=int_, debug_level=verbose, proof=proof), unit) File "/Library/Sage/3.4/local/lib/python2.5/site-packages/sage/rings/ arith.py", line 1849, in __factor_using_pari prev = pari.get_debug_level() File "gen.pyx", line 7871, in sage.libs.pari.gen.PariInstance.get_debug_level (sage/libs/pari/gen.c: 32133) File "gen.pyx", line 7859, in sage.libs.pari.gen.PariInstance.default (sage/libs/pari/gen.c:32038) File "gen.pyx", line 9044, in sage.libs.pari.gen._pari_trap (sage/ libs/pari/gen.c:38611) PariError: (7) There seems to be a problem using pari in a new thread. Any suggestions? Should I report this on SageTrac? Jérôme Tremblay LaCIM, Montréal, Canada --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: constructing a matrix from a list
On Thursday 07 May 2009, Christophe Oosterlynck wrote: > Hi, > > in a cython project of mine, I need to do some intensive work on > arrays and then use these list in a matrix product. Doing the > intensive work on the arrays goes smoothly when using C arrays (using > malloc). Afterwards I convert the C array to a python list and I > construct a matrix over GF(2) from this array so I can use Sage's > quick GF(2) matrix multiplication. I need to do this several times and > it seems that constructing a matrix from a list is slowing everything > down. Is the array a bit array or an int array with zeros and ones? If it is the former you might be able to just use some pointer arithmetic to convince M4RI that your array is its matrix. If it is the latter, it will be much quicker to write the C ints to the matrix directly instead of going through the list, something like this: cdef Py_ssize_t i, j for i from 0 <= i < x: for j from 0 <= j < y: mzd_write_bit(self._entries, i, j, a[i][j] % 2) if a is your two dimensional array. > I want to combine my algorithm to do a transformation on an array with > the possibility to do a matrix multiplication with the list I got from > this algorithm. Is calling matrix(GF(2), x, z, list) the best way to > do this? I find it very slow... The code which does the conversion is this: for i from 0 <= i < self._nrows: if PyErr_CheckSignals(): raise KeyboardInterrupt for j from 0 <= j < self._ncols: mzd_write_bit(self._entries,i,j, int(entries[k]) % 2) k = k + 1 The %2 is stupid and shouldn't be required but I'd need to fix mzd_write_bit first (it explicitly checks for 1 instead of !=0). I don't know how expensive the PyErr_CheckSignals() but the generic entries lookup + the int() are certainly expensive. Bottomline: it is quite generic code which could be made somewhat faster with some care. However, the solution above which avoids all Python data structures directly will always be fastest. Cheers, Martin -- name: Martin Albrecht _pgp: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x8EF0DC99 _otr: 47F43D1A 5D68C36F 468BAEBA 640E8856 D7951CCF _www: http://www.informatik.uni-bremen.de/~malb _jab: martinralbre...@jabber.ccc.de --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] strange characters in notebook
Hi, I am running Sage version 3.4.1 on a CentosOS5 Linux workstation. Sage is compiled from source. I am using the notebook interface through Firefox version 3.0.10 with jsMath v3.6a. In the notebook interface, when I evaluate the contents of a cell, the proper output is 'sandwiched' between sets of strange characters. I apologize for being ignorant as to what the characters are or represent, but there are some square boxes containing '001B' and the strings '[0m' and '[1;30m' repeated several times. I have tried previous versions of both Sage (v3.3) and Firefox (v3.0b5) and the problem is still there. Does anyone have any ideas as to what might be happening and how to fix the problem? Thank you for any help you can offer. -gyro --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: Jmol works from command line, but not notebook
Well, thanks to Jason Grout for helping me on IRC...installing the Sun Java plugin fixed the problem for me in Linux. However, now I'm home on my Macbook, and Jmol isn't working here! In Firefox, I get the same problem, where it's just a black box. Every other Java thing works here, including the Jmol stuff on their website, so this does seem like some kind of Sage or Firefox problem. Everything works fine in Safari, so it's not a system Java issue. Any ideas? Dan -- --- Dan Drake - KAIST Department of Mathematical Sciences --- http://mathsci.kaist.ac.kr/~drake signature.asc Description: Digital signature
[sage-support] Re: running maxima within sage and parallel computing
You could try to use dsage and running multiple instances in parallel. http://sagemath.org/doc/reference/sage/dsage/dsage.html Of course, you need to code something to split and combine the total workload for each client... h On May 7, 11:46 am, chand sarat wrote: > Dear All, > I am not a software programmer. It is possible that this question is not > rightly phrased. > I use Maxima on a Ubuntu 9.04 i386 machine for symbolic computation tasks > that arise in macroeconomics. > I am given to understand that Maxima cannot exploit parallel computing at > present while Sage can. I wish to know whether if i use Sage to run Maxima > on a multicore computer (with a cpu such as AMD Phenom II X4 955 and related > components that i shortly intend to set up) I will be able to gain in terms > of computing speed with the parallel computing prowess of Sage. > C. Saratchand --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: GAP still doesn't start in sage-3.4.1...
On May 7, 2:07 am, Johan Oudinet wrote: > On Sat, May 2, 2009 at 10:57 AM, mabshoff > You're wright Michael! The administrator installed udev package and > now Sage works! Excellent, this was definitely a difficult journey. > Thanks for your help. I'll never find this obscure problem else. Well, thank Gonzalo for figuring it out, I merely remembered the issue from IRC. Gonzalo has posted something that can easily be turned into a check at startup time that will tell the user what to do if either pseudo tty or semaphores for pyprocessing don't work, i.e. if /dev/ pts and/or /dev/shm aren't mounted on Linux for example. Sage 4.0 should then abort with an informative error message instead of just failing mysteriously. See http://trac.sagemath.org/sage_trac/ticket/5965 for details. > -- > Johan > () ascii ribbon campaign - against html e-mail > /\ www.asciiribbon.org - against proprietary attachments Cheers, Michael --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] running maxima within sage and parallel computing
Dear All, I am not a software programmer. It is possible that this question is not rightly phrased. I use Maxima on a Ubuntu 9.04 i386 machine for symbolic computation tasks that arise in macroeconomics. I am given to understand that Maxima cannot exploit parallel computing at present while Sage can. I wish to know whether if i use Sage to run Maxima on a multicore computer (with a cpu such as AMD Phenom II X4 955 and related components that i shortly intend to set up) I will be able to gain in terms of computing speed with the parallel computing prowess of Sage. C. Saratchand --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] constructing a matrix from a list
Hi, in a cython project of mine, I need to do some intensive work on arrays and then use these list in a matrix product. Doing the intensive work on the arrays goes smoothly when using C arrays (using malloc). Afterwards I convert the C array to a python list and I construct a matrix over GF(2) from this array so I can use Sage's quick GF(2) matrix multiplication. I need to do this several times and it seems that constructing a matrix from a list is slowing everything down. I want to combine my algorithm to do a transformation on an array with the possibility to do a matrix multiplication with the list I got from this algorithm. Is calling matrix(GF(2), x, z, list) the best way to do this? I find it very slow... Thanks --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: GAP still doesn't start in sage-3.4.1...
On Sat, May 2, 2009 at 10:57 AM, mabshoff wrote: > > > > On May 2, 1:29 am, William Stein wrote: >> On Sat, May 2, 2009 at 1:27 AM, Johan Oudinet >> wrote: > > > >> > $ mount >> > /dev/hda1 on / type ext3 (rw,errors=remount-ro) >> > tmpfs on /lib/init/rw type tmpfs (rw,nosuid,mode=0755) >> > proc on /proc type proc (rw,noexec,nosuid,nodev) >> > sysfs on /sys type sysfs (rw,noexec,nosuid,nodev) >> > udev on /dev type tmpfs (rw,mode=0755) >> > fusectl on /sys/fs/fuse/connections type fusectl (rw,relatime) >> > automount(pid2614) on /local type autofs >> > (rw,fd=4,pgrp=2614,minproto=2,maxproto=4) >> > automount(pid2642) on /users type autofs >> > (rw,fd=4,pgrp=2642,minproto=2,maxproto=4) >> > automount(pid2872) on /tmpsim type autofs >> > (rw,fd=4,pgrp=2872,minproto=2,maxproto=4) >> > automount(pid2962) on /special type autofs >> > (rw,fd=4,pgrp=2962,minproto=2,maxproto=4) >> > netapp2:/vol/Logiciels/Fortesse on /special/fortesse type nfs >> > (rw,intr,soft,addr=129.175.1.2) >> > netapp-11:/vol/Equipe_asspro/asspro on /users/asspro type nfs >> > (rw,nosuid,intr,hard,tcp,timeo=600,retrans=2,addr=129.175.1.7) >> >> > And I try to run Sage from /users/asspro > > Ok. > >> Is there enough space so you could try doing everything in /tmp or >> /local or some other *non*-NSF local partition? > > Gonzalo had the exact same problem about GAP not starting up when he > was playing around with a Debian chroot env and it turned out that he > needed to mount devpts. According to the output above that (pseudo) > filesystem is not mounted, so before trying anything else I would > recommend to mount it. The kernel might or might not support it out of > the box (since it is a Debian kernel it should). devpts should be > mounted by udev it seems per default, but check out > > http://linux.derkeiler.com/Newsgroups/comp.os.linux.setup/2005-03/0473.html > > on how to mount it. If this turns out to the cause it seems well > worth an entry in the FAQ as well as README.txt since this is a rather > obscure problem. Even adding a check in Sage somewhere to verify that > the devpts is mounted on startup of Sage might be worth it. > >> william > > Cheers, > You're wright Michael! The administrator installed udev package and now Sage works! Thanks for your help. I'll never find this obscure problem else. -- Johan () ascii ribbon campaign - against html e-mail /\ www.asciiribbon.org - against proprietary attachments --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Re: How to cimport a Sage extension class?
PS: > I tested which of these are needed for cimport of RingElement, and I > found that SAGE_ROOT+'/local/include/csage/' suffices. I forgot to tell: Plus SAGE_ROOT+"/devel/sage/", Cheers, Simon --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
[sage-support] Jmol works from command line, but not notebook
Hello,
Jmol is not working for me from the notebook, but works fine from the
command line. I'm using 3.4.1 in Ubuntu Jaunty, with Firefox and the
"icedtea" Java plugin.
When I do this in a terminal, a Jmol window pops up and works great:
sage: u, v = var('u, v')
sage: parametric_plot3d([u*v, u, v^2], (u, -1,1), (v,-1,1))
The same commands in the notebook result in a black Jmol window and the
error message "Jmol script terminated" in the bottom bar of Firefox.
Here's the error messages printed to the terminal by Firefox:
Jmol applet jmolApplet1__440664173941044__ destroyed
Jmol applet jmolApplet2__440664173941044__ initializing
AppletRegistry.checkIn(jmolApplet2__440664173941044__)
urlImage=jar:file:/home/drake/.icedteaplugin/cache/https/sagenb.kaist.ac.kr/java/jmol/JmolApplet0.jar!/jmol75x29x8.gif
applet context: -applet
appletDocumentBase=https://sagenb.kaist.ac.kr:8022/home/admin/0/
appletCodeBase=https://sagenb.kaist.ac.kr:8022/java/jmol/
(C) 2008 Jmol Development
Jmol Version 11.6.16 2008-11-24 13:39
java.vendor:Sun Microsystems Inc.
java.version:1.6.0_0
os.name:Linux
memory:44.7/71.8
useCommandThread: false
appletId:jmolApplet2__440664173941044__
FileManager opening
https://sagenb.kaist.ac.kr:8022/java/jmol/appletweb/SageMenu.mnu
defaults = "Jmol"
backgroundColor = "black"
language=en_US
FileManager opening
https://sagenb.kaist.ac.kr:8022/home/admin/0/cells/3/sage0-size500.jmol?1241679757
script compiler ERROR: command expected
line 1 command 1 of /home/admin/0/cells/3/sage0-size500.jmol?1241679757:
script ERROR: script compiler ERROR: command expected
line 1 command 1 of /home/admin/0/cells/3/sage0-size500.jmol?1241679757:
eval ERROR:
line 1 command 1:
script >> "/home/admin/0/cells/3/sage0-size500.jmol?1241679757" <<
The applet on the Jmol main page works fine, as well as their "browser
check" page. Other Java applets work fine.
A colleague here told me that Jmol wouldn't work for him at all, and
he was using IE and Chrome. (I'm not sure if he's having the same
problem, although he is using the same server.) Any ideas on what's wrong?
Dan
--
--- Dan Drake
- KAIST Department of Mathematical Sciences
--- http://mathsci.kaist.ac.kr/~drake
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Description: Digital signature
[sage-support] Re: How to cimport a Sage extension class?
Dear William, On May 6, 7:53 pm, William Stein wrote: ... > Here's a little notebook session that uses cimport from the Sage > library to do evil mutation of a sage integer: ... > cd to that directory, and go into the spyx subdirectory. > Look at the setup.py file there. OK, and there, I see a lot of include directories: '/home/king/SAGE/devel/sage-3.2.3/local/include/csage/',* '/home/king/SAGE/devel/sage-3.2.3/local/include/', * '/home/king/SAGE/devel/sage-3.2.3/local/include/python2.5/',* '/home/ king/SAGE/devel/sage-3.2.3/devel/sage/sage/ext/', * '/home/king/SAGE/devel/sage-3.2.3/devel/sage/', * '/home/king/SAGE/devel/sage-3.2.3/devel/sage/sage/gsl/', '/home/ king/.sage/sage_notebook/worksheets/admin/12/code' I tested which of these are needed for cimport of RingElement, and I found that SAGE_ROOT+'/local/include/csage/' suffices. So, you made my day, William! Thank you Simon --~--~-~--~~~---~--~~ To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support-unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URLs: http://www.sagemath.org -~--~~~~--~~--~--~---
