[sage-support] Re: ndsolve??

[dabu]

Hi,
Many thanks. I will try to have a look.
best,
Pallab
On Mar 25, 1:05 pm, Jason Grout  wrote:
> On 03/25/2010 10:25 AM, dabu wrote:
>
>
>
> > Hi,
>
> > I am new in sage. I was wondering about Sage's capability to solve
> > odes numerically.
>
> > I was expecting to find something which is like ndsolve of
> > Mathematica.
> > For example it should not only as for the first order equations, nor
> > that one has to supply jacobians manually. It should also tackle
> > boundary conditions as equations.
>
> > I wonder any such things exist. Without such a construct. Sage would
> > not be useful (read compete with Mathematica :)) to a large part of
> > theoretical physics community.
>
> > I would be happy to write such a thing in case it does not exist.
>
> I've always just used the scipy functions to do this sort of thing,
> though I'm not an expert in the area, so I'm not sure what the scipy
> functionality is missing.  See:
>
> http://www.sagenb.org/home/pub/258/- basic 
> examplehttp://www.sagenb.org/home/pub/106/- calculating streamlines in 
> Sagehttp://www.sagenb.org/home/pub/879/- epidemic 
> modelinghttp://www.sagenb.org/home/pub/42/- spring-mass systems
>
> Docs:
>
> http://docs.scipy.org/doc/scipy/reference/tutorial/integrate.html#ord...
>
> http://docs.scipy.org/doc/scipy/reference/generated/scipy.integrate.o...
>
> http://docs.scipy.org/doc/scipy/reference/generated/scipy.integrate.o...
>
> It would be great to have something like this (or wrap the scipy stuff)
> in Sage, so if you want to contribute, go for it!  I would be glad to
> see it.
>
> Thanks,
>
> Jason

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Re: [sage-support] sage 4.3.0.1-solaris

[Dr. David Kirkby]

Dr. David Kirkby wrote:

andrea previtali wrote:

Hi,
I'trying to install sage on a Solaris machine and get the following

previ...@gauss /share/sage-4.3.0.1-Solaris-10-SPARC-sun4u-or-sun4v 
$./sage

--
| Sage Version 4.3.0.1, Release Date: 2010-01-28 |
| Type notebook() for the GUI, and license() for information.|
--
'import site' failed; use -v for traceback
  File 
"/share/sage-4.3.0.1-Solaris-10-SPARC-sun4u-or-sun4v/local/bin/sage-location", 
line 67

return ' '.join(set(x for x in r.split() if x in FLAGS))
^
SyntaxError: invalid syntax


Bye


I've no idea why this is happening, although I was the one who created 
that SPARC binary. I've moved it around on different systems, with 
different install paths and not had a problem.


The documentation which says the latest version to build on Solaris is 
4.3.0.1 is outdated (my fault). 4.3.4 does fully build on Solaris, and 
passes all the tests - something that 4.3.0.1 never did.


I've just started to create a .lzma format file at:

http://boxen.math.washington.edu/home/kirkby/sage-4.3.4-Solaris-sun4u-SunOS.tar.lzma 


That has finished. I suggest you download that, but build the lzma decompression 
program to decompress it. It will probably take you far less time to build the 
decompression program than it will to download a .bz2 file, which would be 200 
/MB larger (.bz2 is around 500 MB


I've started to compress it with p7zip on a Sun SPARC. You will find the file in 
this directory:


http://boxen.math.washington.edu/home/kirkby/Solaris-binaries/

but I suspect that will take hours to compress. Once that is done, you can 
download that and just use p7zip on Solaris to decompress it.


Let us know how you get on.

That binary was created on a sun4u machine and has been run on sun4v too and 
passes all the self-tests.



Dave

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Re: [sage-support] sage 4.3.0.1-solaris

[Dr. David Kirkby]

andrea previtali wrote:

Hi,
I'trying to install sage on a Solaris machine and get the following

previ...@gauss /share/sage-4.3.0.1-Solaris-10-SPARC-sun4u-or-sun4v $./sage
--
| Sage Version 4.3.0.1, Release Date: 2010-01-28 |
| Type notebook() for the GUI, and license() for information.|
--
'import site' failed; use -v for traceback
  File 
"/share/sage-4.3.0.1-Solaris-10-SPARC-sun4u-or-sun4v/local/bin/sage-location", 
line 67

return ' '.join(set(x for x in r.split() if x in FLAGS))
^
SyntaxError: invalid syntax


Bye


I've no idea why this is happening, although I was the one who created that 
SPARC binary. I've moved it around on different systems, with different install 
paths and not had a problem.


The documentation which says the latest version to build on Solaris is 4.3.0.1 
is outdated (my fault). 4.3.4 does fully build on Solaris, and passes all the 
tests - something that 4.3.0.1 never did.


I've just started to create a .lzma format file at:

http://boxen.math.washington.edu/home/kirkby/sage-4.3.4-Solaris-sun4u-SunOS.tar.lzma

At the time of writing, this is not completed - lzma is a slow compression 
method. But I would expect it would be done in another half hour or so.


Once the modification time of the file is some time in the past, I suggest you 
download that. I'm not sure if the extension .lzma can be decompressed with the 
'7za / p7zip' program on Solaris. You might find if you rename the .lzma to .7z 
it will work. (If not, you will need to build the lzma program to decompress 
it). I would have created it on a Sun SPARC using 'p7zip', but the Sun SPARC at 
the University of Washington is ill suited for Sage developement and will take 
hours to compress that file. So I moved it to a Linux box and used lzma 
compression. I think the compression methods are the same.


If all else fails, you can download a tar file:

http://boxen.math.washington.edu/home/kirkby/sage-4.3.4-Solaris-sun4u-SunOS.tar

but at 1.6 GB, it is much larger than the .lzma format file will be, which will 
be around 300 MB once it is compressed.


Dave


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Re: [sage-support] Refer in Paper

[Minh Nguyen]

Hi,

On Fri, Mar 26, 2010 at 5:53 AM, Santanu Sarkar
 wrote:
> How can I refer SAGE 4.1.1  in my  research paper?

It would be nice if you could tell us where your preprint is located
(e.g. arXiv) or when your paper is published. That way, the paper
could be added to the list of publications at

http://www.sagemath.org/library-publications.html

-- 
Regards
Minh Van Nguyen

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Re: [sage-support] Refer in Paper

[Martin Albrecht]

On Thursday 25 March 2010, Santanu Sarkar wrote:
> How can I refer SAGE 4.1.1  in my  research paper?

See:
 
http://wiki.sagemath.org/Publications_using_SAGE
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[sage-support] Refer in Paper

[Santanu Sarkar]

How can I refer SAGE 4.1.1  in my  research paper?

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Re: [sage-support] Monomial problem

[Santanu Sarkar]

Thank you.

On 25 March 2010 18:29, Martin Albrecht wrote:

> sage: R.=QQ[]
> sage: f=(x^2/x)
> sage: type(f)
> 
> sage: f.monomials() # this fails because f is a fraction field element
> Traceback (most recent call last)
> ...
>
>
> sage: f=(x^2//x)  # note the //
> sage: type(f)
> 
> sage: f.monomials() # this fails because univariate polynomials don't have
> a
>  # monomials method
> ---
> Traceback (most recent call last)
> ...
>
> sage: R.=PolynomialRing(QQ,1) # constructing a multivariate ring
> sage: f=(x^2//x)
> sage: f.monomials() # yay!
> [x]
>
> Hope that helps,
> 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
>
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Re: [sage-support] problems saving images from notebook

[Renato]

On Thu, 25 Mar 2010 17:14:35 +0100
Jose Guzman  wrote:

> Renato wrote:
> > Hello, I'm using sage notebook and I'm having some headache to save
> > the images generated by show(). The problem is that 3/4 of the time
> > if i right click on the image and do "open image" I get a page with:
> >
> >   
> Why don't you try for example this?
> 
> sage: figure = plot(sin(x),0,2*pi)
> sage: figure.save('/home/user/sin.pdf', dpi=300)
> 
> Best.
> 
> Jose
> 

ah, thanks, this is much neater indeed :)

renato

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[sage-support] Re: ndsolve??

[Jason Grout]

On 03/25/2010 10:25 AM, dabu wrote:

Hi,

I am new in sage. I was wondering about Sage's capability to solve
odes numerically.

I was expecting to find something which is like ndsolve of
Mathematica.
For example it should not only as for the first order equations, nor
that one has to supply jacobians manually. It should also tackle
boundary conditions as equations.

I wonder any such things exist. Without such a construct. Sage would
not be useful (read compete with Mathematica :)) to a large part of
theoretical physics community.

I would be happy to write such a thing in case it does not exist.



I've always just used the scipy functions to do this sort of thing, 
though I'm not an expert in the area, so I'm not sure what the scipy 
functionality is missing.  See:


http://www.sagenb.org/home/pub/258/ - basic example
http://www.sagenb.org/home/pub/106/ - calculating streamlines in Sage
http://www.sagenb.org/home/pub/879/ - epidemic modeling
http://www.sagenb.org/home/pub/42/ - spring-mass systems

Docs:

http://docs.scipy.org/doc/scipy/reference/tutorial/integrate.html#ordinary-differential-equations-odeint

http://docs.scipy.org/doc/scipy/reference/generated/scipy.integrate.odeint.html#scipy.integrate.odeint

http://docs.scipy.org/doc/scipy/reference/generated/scipy.integrate.ode.html#scipy.integrate.ode

It would be great to have something like this (or wrap the scipy stuff) 
in Sage, so if you want to contribute, go for it!  I would be glad to 
see it.


Thanks,

Jason

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[sage-support] Re: show(): units of figsize option

[Jason Grout]

On 03/25/2010 06:38 AM, Renato wrote:

Hello, in the help of show I read:

``figsize``- [width, height] (same for square aspect)

I'm wandering, are width and height expressed in pixels, centimeters or
what? Can I change this? (I.e. spell it in pixels or centimeters as I
need)



figsize is in inches.  This should be added to the documentation (see 
http://trac.sagemath.org/sage_trac/ticket/5956)


Thanks,

Jason

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[sage-support] Re: newbie: plot() questions

[Jason Grout]

On 03/25/2010 02:43 AM, Jose Guzman wrote:

Jose Guzman wrote:





Some time ago I wrote a Sage worksheet to get familiar with the
plotting possibilities of Sage. You can find it here:
www.*sage*nb.org/home/pub/399/


Actually the page does not display the graphics, if you want to have a
copy of the worksheet just mail me and I can share it in sagebn.org or
simply send you.



This is a very nice page!  If you give permission, we should add this 
page to the Sage documentation somewhere (the tutorial, maybe?)


Thanks,

Jason

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Re: [sage-support] problems saving images from notebook

[Jose Guzman]

Renato wrote:

Hello, I'm using sage notebook and I'm having some headache to save the
images generated by show(). The problem is that 3/4 of the time if i
right click on the image and do "open image" I get a page with:

  

Why don't you try for example this?

sage: figure = plot(sin(x),0,2*pi)
sage: figure.save('/home/user/sin.pdf', dpi=300)

Best.

Jose

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[sage-support] ndsolve??

[dabu]

Hi,

I am new in sage. I was wondering about Sage's capability to solve
odes numerically.

I was expecting to find something which is like ndsolve of
Mathematica.
For example it should not only as for the first order equations, nor
that one has to supply jacobians manually. It should also tackle
boundary conditions as equations.

I wonder any such things exist. Without such a construct. Sage would
not be useful (read compete with Mathematica :)) to a large part of
theoretical physics community.

I would be happy to write such a thing in case it does not exist.

thanks,
Pallab

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[sage-support] Re: show(): units of figsize option

[Renato]

On Thu, 25 Mar 2010 12:38:39 +0100
Renato  wrote:

> Hello, in the help of show I read:
> 
> ``figsize``- [width, height] (same for square aspect)
> 
> I'm wandering, are width and height expressed in pixels, centimeters
> or what? Can I change this? (I.e. spell it in pixels or centimeters
> as I need)
> 
> thanks
> Renato

Testing I see the overall dimension also depends on the value of the
dpi option; still have to understand exactly how the interplay between
dpi and figsize works

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[sage-support] problems saving images from notebook

[Renato]

Hello, I'm using sage notebook and I'm having some headache to save the
images generated by show(). The problem is that 3/4 of the time if i
right click on the image and do "open image" I get a page with:

You are not logged in or do not have access to the worksheet '4'.

(while when it works it will open up the image in my image viewer) and
if I do "save image as" it will save the file but I won't be able to
open it with any viewer. I still haven't understood if it's random or
reproducible with some actions. Even signing out and back in doesn't
give consistent results (sometimes it solves the problem, others no).
Any suggestions?

I'm using:
Sage 4.3
ArchLinux, 2.6.31 kernel
Epiphany (browser)
gpicview (image viewer)

thanks 
Renato

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[sage-support] sage 4.3.0.1-solaris

[andrea previtali]

Hi,
I'trying to install sage on a Solaris machine and get the following

previ...@gauss /share/sage-4.3.0.1-Solaris-10-SPARC-sun4u-or-sun4v $./sage
--
| Sage Version 4.3.0.1, Release Date: 2010-01-28 |
| Type notebook() for the GUI, and license() for information.|
--
'import site' failed; use -v for traceback
  File
"/share/sage-4.3.0.1-Solaris-10-SPARC-sun4u-or-sun4v/local/bin/sage-location",
line 67
return ' '.join(set(x for x in r.split() if x in FLAGS))
^
SyntaxError: invalid syntax


Bye

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Re: [sage-support] Monomial problem

[Martin Albrecht]

sage: R.=QQ[]  
sage: f=(x^2/x)   
sage: type(f) 
   
sage: f.monomials() # this fails because f is a fraction field element
Traceback (most recent call last)
...


sage: f=(x^2//x)  # note the //
sage: type(f)

sage: f.monomials() # this fails because univariate polynomials don't have a 
  # monomials method
---
Traceback (most recent call last)
...

sage: R.=PolynomialRing(QQ,1) # constructing a multivariate ring
sage: f=(x^2//x)
sage: f.monomials() # yay!
[x]

Hope that helps,
Martin


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[sage-support] Monomial problem

[Santanu Sarkar]

Suppose x is a variable. Then the following does not work.
R.=QQ[]
f=(x^2/x)
print f.monomials()

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[sage-support] show(): units of figsize option

[Renato]

Hello, in the help of show I read:

``figsize``- [width, height] (same for square aspect)

I'm wandering, are width and height expressed in pixels, centimeters or
what? Can I change this? (I.e. spell it in pixels or centimeters as I
need)

thanks
Renato

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Re: [sage-support] greek letters and underscores in graphics

[Renato]

On Thu, 25 Mar 2010 08:42:05 +0100
Jose Guzman  wrote:

> Renato wrote:
> > and it works fine. The problem is I'd like to use greek letters in
> > the text, and also underscore indexes. Here's the latex code of
> > what I'd like:
> >
> > $\lambda_{0}$
> >
> > can I somehow display that as text next to the plot??
> >
> > thanks
> > Renato
> >
> >   
> Something like this should work:
> 
> sage: equation = text('$\\lambda_{0}$', fontsize=20)
> 
> Remember to write an additional "\" in the string when inserting the
> \ before any latex.
> 
> Best.
> 

ok, the above works. I had some problems because I also needed
to use the format method on the string, so the {0} was getting
substituted with the first argument of format!! I.e. the following
didn't behave like I'd liked it to:

something = 45;
text("$\\lambda_{0}$ = {0}".format(something), (0,0.8), axis_coords=True, 
horizontal_alignment='left');

As a workaround I just did this, which is working as I want it to:

something = 45;
text("$\\lambda_{0}$ = {1}".format(0,something), (0,0.8), axis_coords=True, 
horizontal_alignment='left');


many thanks!!
Renato

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[sage-support] Unable to Connect to Local Host

[NCP]

I'm running Sage on Windows Vista through Sun VirtualBox. After
loading the Virtual Machine, and trying to open the notebook, I
consistently get the message "Unable to connect: Firefox can't
establish a connection to the server at localhost:8000".

If I type in the IP address given in the top left hand corner (http://
192.168.56.102), Firefox tells me that the connection has timed out
and is unable to connect.

This did not happen the first time I installed Sage (or the second
time); it only happens when I shut the Virtual Machine down and try to
start it up again.

I've noticed that somebody running Sage through Sun VirtualBox had the
same problem -- is this redeemable?

Thanks for your help.

Nenna C-P

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[sage-support] Re: SAGE server in Ukraine

[Harald Schilly]

On Mar 25, 10:32 am, dmitrey  wrote:
> http://sage.openopt.org ...

Cool! The published worksheets are nice and somebody can start playing
with openopt right away.

btw, latest optional openopt suite spkg is waiting here:
http://trac.sagemath.org/sage_trac/ticket/7708

H

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[sage-support] Re: bug in taylor expansion with sage and maxima

[sgouezel]

> This appears to be triggered by keepfloat:true which
> I think Sage does, right? With keepfloat:false the error
> is avoided, if I'm not mistaken.

Indeed, it works fine with keepfloat:false in maxima.

> Please file a report in the Maxima bug 
> tracker,http://sourceforge.net/projects/maxima/bugs
> or thereabouts.

Done.

Strangely, ( 2.0*sin(x)^3 - 1.0*sin(x)).taylor(x, 0, 3) works in
maxima, but not in sage. It seems that sage removes the 1.0 before
sending the data to maxima.

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[sage-support] SAGE server in Ukraine

[dmitrey]

Hi all,
FYI we have created SAGE server in Ukraine, our website (Ukrainian
language) is http://sage.openopt.org and SAGE Calculator works at
https://sage.openopt.org:8000. Also we have latest OOSuite installed
there (OpenOpt, FuncDesigner, DerApproximator) that is updated from
subversion repository each server reboot. However you should be aware
that our hardware is very primitive yet (Intel Xeon 5500 3.2GHz, HDD
30 Gb, 1 Gb RAM) and thus you shouldn't use it for mature problems.

Regards, Dmitrey.

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Re: [sage-support] newbie: plot() questions

[Jose Guzman]

Jose Guzman wrote:


 
Some time ago I wrote a Sage worksheet to get familiar with the 
plotting possibilities of Sage. You can find it here:

www.*sage*nb.org/home/pub/399/

Actually the page does not display the graphics, if you want to have a 
copy of the worksheet just mail me and I can share it in sagebn.org or 
simply send you.


Best.

Jose

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Re: [sage-support] greek letters and underscores in graphics

[Jose Guzman]

Renato wrote:

and it works fine. The problem is I'd like to use greek letters in the
text, and also underscore indexes. Here's the latex code of what I'd
like:

$\lambda_{0}$

can I somehow display that as text next to the plot??

thanks
Renato

  

Something like this should work:

sage: equation = text('$\\lambda_{0}$', fontsize=20)

Remember to write an additional "\" in the string when inserting the \ 
before any latex.


Best.

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