Re: [sage-support] plot(): no ticks and arrow on axes?
On Mon, Jan 31, 2011 at 12:48 AM, Francois Maltey fmal...@nerim.fr wrote: Renato a écrit : Hello, I can't understand how the ticks option works in plot()... I want to have no ticks or labels on the axis. Also, is it possible to show the arrows on the axis? like this: http://www.homeschoolmath.net/blog/few-complex-numbers.gif I'm using latest version of sage Search ticks and axes in plot? and copy/paste the examples : plot(sin(pi*x), (x, -8, 8), ticks=[[],[]], axes=false) + arrow((-8,0),(8,0), color=black) + arrow((0,-1),(0,1), color=black) If you want a grid add a function as def grid (xmin, xmax, ymin, ymax) : linesYcst = add (line ([(xmin, k), (xmax, k)]) for k in [ceil (ymin).. floor(ymax)]) linesXcst = add (line ([(k, ymin), (k, ymax)]) for k in [ceil (xmin).. floor(xmax)]) return linesXcst+linesYcst read the help about line2d? and find the right options ! Then add to your (almost) last plot : + grid (the right area) F. many thanks renato -- 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 URL: http://www.sagemath.org
[sage-support] Re: sage-64.txt
I have received the same problem, but I have the impression that it stopped after having launched Sage in sudo mode once and executing a small program (nothing special, just some stupid computation). Maybe Sage tries to write this information in a place that needs sudo? Otherwise, my sage folder is just inside of /Applications folder (this could explain why we need sudo, if sage tries to write in a subfolder of this tree). On 31 jan, 02:56, Michael Beeson profbee...@gmail.com wrote: I downloaded the latest 64-bit dmg of Sage for OS X and installed it. It works, but I get a strange error message about sage-64.txt. Specifically, if I put the following lines in a sage file and run sage with that file for input, (here are the lines) L = [[cos(pi*i/100),sin(pi*i/100)] for i in range(200)] print 1; p = polygon(L, rgbcolor=(1,1,0)) print 2; p.show() print 3 then I do get the plot from p.show, but in the console window I get the following output: Detected SAGE64 flag Building Sage on OS X in 64-bit mode Building Sage on OS X in 64-bit mode Creating SAGE_LOCAL/lib/sage-64.txt since it does not exist Detected SAGE64 flag Building Sage on OS X in 64-bit mode Building Sage on OS X in 64-bit mode Creating SAGE_LOCAL/lib/sage-64.txt since it does not exist Detected SAGE64 flag Building Sage on OS X in 64-bit mode 1 2 3 Michael-Beesons-iMac:~ beeson$ The error messages repeat once for every line in the input file (yet the all precede the output from any of the commands). If sage is started from the shell prompt, I get this error message just once, and the interactive session is thereafter normal. Googling the error message produced a reference to patch 9960 but I couldn't make sense of what to do to fix it. Searching this site for the error message or for sage-64.txt produced no results. -- 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 URL: http://www.sagemath.org
[sage-support] Re: Fwd: Integral functions
Thanks kcrisman!!!
Maybe the choice of the function sin(x)/x was not a good one...i would
to extend the derivation for generally integral function (F(x)=int_a^x
g(t)dt) where does't exist a primitive of g. I try with some function
and my procedure seems to work.
Thanks!
On 27 Gen, 14:41, kcrisman kcris...@gmail.com wrote:
On Jan 27, 7:51 am, Andrea Gobbi andreamat...@gmail.com wrote:
Hi!
Maybe I resolve it...:
def deriv(self, *args,**kwds): print args, kwds; return w(x)
f(x)=-x*x*x+1
w(x)=sin(x)/x
tc=3
def ef(self,x,parent=None):
return numerical_integral(w,tc,x)[0]
g=function('g',nargs=1,evalf_func=ef,derivative_func=deriv)
Believe it or not, it wouldn't be too much harder to implement the
sine integral Si(x) for Sage in general - as long as we had a reliable
evaluation function in Pari, Scipy, mpmath, or somewhere. mpmath at
least has
it:http://mpmath.googlecode.com/svn/trunk/doc/build/functions/expintegra...
I can't believe we don't have this already. Am I missing something -
can someone else confirm this (though search_src and a Google search
revealed nothing, and none of the usual suspects in sage/functions
have it)?
- kcrisman In this way i can correctly compute for example the derivative of
f(integral(w)) as:
(diff(f(g(x)),x,1)
And the value assumed for example in 4
(diff(f(g(x)),x,1)(4).n())
and this works also for n-th-derivative.
I apologize if you waste time :-)
Thanks!
Andrea Gobbi
-- Forwarded message --
From: Andrea Gobbi andreamat...@gmail.com
Date: 2011/1/26
Subject: Integral functions
To: sage-support sage-support@googlegroups.com
Hi!
I have a question...I'm working with integral functions:
var('t,x')
f(t)=t^2
F(x)=integral(f,t,0,x)
and obviously:
F(x).derivative() give x^2 as result.
Now the question is: can i have the same result if f doesn't admit a
primitive? I think that when sage sees integral(f,t,0,x), tries to
compute a primitive G and then assigns to F the difference between
G(x) and G(0). In this way when i try to calculate the derivative of
F, the result is f.
For example:
var('t,x')
f(t)=t^2
F(x)=integral(sin(t)/t,t,1,x,assume(x1))
I look at the reference manual and I find a section in which we can
force a funcion to have a rule for the derivation (pag. 252) but I
don't understand how to do this. Sorry for my awful english!
Thank you!
Best regards!
Andrea Gobbi
--
Andrea Gobbi
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Re: [sage-support] Re: Error starting sage after a source build
Well, some bad and good news:
The bad:
I reinstalled ubuntu (not specifically for sage, as there were other things
I've been trying to solve for a long time, but it helped me decide to do
it), reinstalled sage, and I get exactly the same error.
The good:
I think I am closer now to find the cause of the problem: I have ipython
from git locally built, and thus I have PYTHONPATH defined. It seems sage is
using my own version of ipython:
jscandal@jorges { ~/sw/sage/sage-4.6.1 }$ ./sage -python
Python 2.6.4 (r264:75706, Jan 31 2011, 12:29:16)
[GCC 4.4.5] on linux2
Type help, copyright, credits or license for more information.
import IPython
IPython.__file__
'/home/jscandal/sw/ipython/ipython-git/IPython/__init__.pyc'
What are the rules in sage regarding PYTHONPATH? I would have thought that
sage would use its own version of every package. My use of PYTHONPATH is
probably interfering so, how do I get my local ipyhton (and other modules
and libraries) play nice with sage? Can it be configured a-posteriori?
Thanks for any pointers.
jorges
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[sage-support] Re: plot(): no ticks and arrow on axes?
On 1/30/11 5:48 PM, Francois Maltey wrote: Renato a écrit : Hello, I can't understand how the ticks option works in plot()... I want to have no ticks or labels on the axis. Also, is it possible to show the arrows on the axis? like this: http://www.homeschoolmath.net/blog/few-complex-numbers.gif I'm using latest version of sage Search ticks and axes in plot? and copy/paste the examples : plot(sin(pi*x), (x, -8, 8), ticks=[[],[]], axes=false) + arrow((-8,0),(8,0), color=black) + arrow((0,-1),(0,1), color=black) If you want a grid add a function as def grid (xmin, xmax, ymin, ymax) : linesYcst = add (line ([(xmin, k), (xmax, k)]) for k in [ceil (ymin).. floor(ymax)]) linesXcst = add (line ([(k, ymin), (k, ymax)]) for k in [ceil (xmin).. floor(xmax)]) return linesXcst+linesYcst We also have gridlines implemented: http://sagemath.org/doc/reference/sage/plot/plot.html#sage.plot.plot.Graphics.show (see the gridline bullet point, or search the examples for Add grid lines at the major ticks of the axes. and the few examples following that) 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 URL: http://www.sagemath.org
[sage-support] Re: Plotting: axes with ticks but with no labels
On Jan 28, 11:20 pm, kcrisman kcris...@gmail.com wrote: On Jan 28, 9:52 am, D. S. McNeil dsm...@gmail.com wrote: On Fri, Jan 28, 2011 at 9:08 PM, Jeff wrote: I would like to be able to plot a function, e.g. plot(sin), that has axes and ticks on the axes but that does not have labels for the ticks. I understand that I might be able to do this using a ticker formatter, perhaps also, by directly using matplotlib, but I do not know exactly how to go about doing this. There may be a simpler way, but: import matplotlib p = plot(sin) p.show(tick_formatter=(matplotlib.ticker.NullFormatter(), matplotlib.ticker.NullFormatter())) worked for me. The repetition is to make sure that both x and y tick labels are turned off. Yes, if you look athttp://www.sagemath.org/doc/reference/sage/plot/plot.html and search for tick_formatter, you will see documentation for this. Do you think it would be worth having the null formatter as a specified option? The string null could easily have the default be the null formatter - that would be easy to add. - kcrisman First of all thanks to you and the others for the helpful suggestions. Whatever it ends up being called, a null formatter option would be useful, I think. In fact, it would be nice to be able to specify arbitrary labels for each tick mark (not necessarily corresponding to the numbers that they represent). I don't think this done in http://www.sagemath.org/doc/reference/sage/plot/plot.html, although with matplotlib directly I suppose it could be done. So, for example, along with tick mark specifications such as [ [1, 1,2], [ 2, 3] ], there could be a corresponding tick label list: [ ['label for tick at 1', 'label for tick at 1.2'], ['label for tick 2', 'label for tick 3'] ]. If I remember rightly there might be something a bit like this in Mathematica. Jeff -- 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 URL: http://www.sagemath.org
[sage-support] Re: Plotting: axes with ticks but with no labels
On Jan 28, 10:52 pm, D. S. McNeil dsm...@gmail.com wrote: On Fri, Jan 28, 2011 at 9:08 PM, Jeff wrote: I would like to be able to plot a function, e.g. plot(sin), that has axes and ticks on the axes but that does not have labels for the ticks. I understand that I might be able to do this using a ticker formatter, perhaps also, by directly using matplotlib, but I do not know exactly how to go about doing this. There may be a simpler way, but: import matplotlib p = plot(sin) p.show(tick_formatter=(matplotlib.ticker.NullFormatter(), matplotlib.ticker.NullFormatter())) worked for me. The repetition is to make sure that both x and y tick labels are turned off. Doug -- Department of Earth Sciences University of Hong Kong Thanks Doug, I've just tried this method and it worked very well. Jeff -- 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 URL: http://www.sagemath.org
Re: [sage-support] Re: Error starting sage after a source build
I did a clean install, removing from my .bashrc two lines defining the PYTHONPATH and the PATH variables, opening a new terminal and making sure there were no traces of those variables in the environment. Sage built ok, but I got the same error upon starting sage. Then it occurred to me that I could move/rename the local ipython folder, and so I did it, and sage finally started OK! Now, how is sage picking my local version of ipython? Isn't it supposed to provide its own version? I will eventually have to start using my local copy of ipython (and other libraries that I build from source). How can I stop sage from looking outside its own directory tree? jorges -- 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 URL: http://www.sagemath.org
[sage-support] Building error on Pari
Hello, I downloaded the source version of Sage and I ran into this error while building: gcc -c -O3 -Wall -fno-strict-aliasing -fomit-frame-pointer -O3 -g -I. -I../src/headers -fPIC -o base3.o ../src/basemath/base3.c gcc: Internal error: Killed (program cc1) Please submit a full bug report. See http://bugs.opensuse.org/ for instructions. make[3]: *** [base3.o] Error 1 make[3]: Leaving directory `/home/xxx/sage-4.6.1/spkg/build/pari-2.4.3.alpha.p0/src/Olinux-x86_64' make[2]: *** [gp] Error 2 make[2]: Leaving directory `/home/xxx/sage-4.6.1/spkg/build/pari-2.4.3.alpha.p0/src' Error building GP real 9m15.553s user 8m52.292s sys 0m3.862s sage: An error occurred while installing pari-2.4.3.alpha.p0 My system is as follows OS: Linux 2.6.31.14-0.4-desktop x86_64 System: openSUSE 11.2 (x86_64) Gnome: 2.28.2 KDE: 4.3.5 (KDE 4.3.5) release 0 Processor (CPU): Intel(R) Xeon(R) CPU W3570 @ 3.20GHz Speed: 3,200.53 MHz Cores: 4 Total memory (RAM): 5.8 GiB gcc (SUSE Linux) 4.4.1 [gcc-4_4-branch revision 150839] g++ (SUSE Linux) 4.4.1 [gcc-4_4-branch revision 150839] GNU Fortran (SUSE Linux) 4.4.1 [gcc-4_4-branch revision 150839] On a second attempt, the compiler just hung on the same file (base3.c) as well as attempts to build pari (pari-2.4.3.alpha.p0, version shipped with sage) from source independently. Any thoughts on this would be much appreciated. Thanks, Edgar -- Dr. Edgar A. Duenez-Guzman Postdoctoral Fellow Department of Organismic and Evolutionary Biology Harvard University -- Dr. Edgar A. Duenez-Guzman Postdoctoral Fellow Department of Organismic and Evolutionary Biology Harvard University -- 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 URL: http://www.sagemath.org
[sage-support] Re: Building error on Pari
GCC 4.4.1 is broken, and has been fixed a long time ago. Right now we have 4.4.5 and 4.5.2. Do yourself a favor and upgrade. There is a patched PARI spkg on trac that will avoid the compiler error at the cost of decreased performance. Volker -- 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 URL: http://www.sagemath.org
Re: [sage-support] Re: Error starting sage after a source build
There might be something in ~/.ipythonrc that pulls in your own ipython. -- 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 URL: http://www.sagemath.org
Re: [sage-support] Re: Error starting sage after a source build
I mean ~/.ipython/ -- 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 URL: http://www.sagemath.org
[sage-support] Bug with ending line in question mark in NB
I think this is known, but I couldn't find the Trac ticket. If you end a line with a question mark in the notebook, even after a # (comment sign), the nb interprets this as a request for documentation, ending with (potentially) amusing/destructive results. is_prime(5) # Is this number prime? unknown object 'prime' or something like that. Interestingly, one of my students noted that is_prime(5) # Is this number prime'?' True works. I guess that's not totally surprising. Still, it's unfortunate. So if it isn't known, I'm reporting it. Would it be quite easy to fix? (?) - kcrisman -- 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 URL: http://www.sagemath.org
Re: [sage-support] Re: Error starting sage after a source build
There seem to be nothing special in ~/.ipython:
jscandal@jorges { ~/sw }$ ls /home/jscandal/.ipython/
Crash_report_ipython.txt history ipython_config_pylab.py
dbhistory.json ipython_config_pysh.py
I have even moved ~/.ipython elsewhere, but sage will load the ipython from
my local directory, if it is available, and thus give the import error. It's
like if the path was hardcoded somewhere, but I don't see where. It's not in
the environment, as $ env | grep -i python returns nothing.
Wait! I think it's picking up ~/.local/bin/ipython, which has hardcoded the
location:
jscandal@jorges { ~/.local_disabled/bin }$ cat ipython
#!/usr/bin/python
# EASY-INSTALL-DEV-SCRIPT: 'ipython==0.11.dev','ipython'
__requires__ = 'ipython==0.11.dev'
from pkg_resources import require; require('ipython==0.11.dev')
del require
__file__ = '/home/jscandal/sw/ipython/ipython-git/IPython/scripts/ipython'
execfile(__file__)
I think that is what is going on. ~/.local/bin must be a standard place to
look for binaries? Is it expected to be like that? How does sage avoids, for
example, picking up on the system's python? Shouldn't it be the same here?
Well, at least I have an idea now, let's see if I can figure out a
workaround.
jorges
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[sage-support] real part incorrectly simplified away
Here are the contents of a sage file.
var('z')
C = ComplexField()
i = C(0,1)
X = real(integral(z,z))
print X
X = simplify(X)
print X
Here is the corresponding output
1/2*real_part(z)^2 - 1/2*imag_part(z)^2
1/2*z^2
The first line is already surprising as I expected 1/2 *
real_part(z^2). But it's mathematically correct!
The second line, however, is not correct.
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[sage-support] Re: real part incorrectly simplified away
It seems that var('z') makes sage think z is real.
simplify(real(z)) returns z and simplify(imag(z)) returns 0.
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Re: [sage-support] Re: Error starting sage after a source build
$HOME/.local/bin is not a standard place to look for executables. It will only be searched if you put it into the PATH yourself. -- 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 URL: http://www.sagemath.org
Re: [sage-support] Re: real part incorrectly simplified away
On Mon, 31 Jan 2011 14:19:51 -0800 (PST)
Michael Beeson profbee...@gmail.com wrote:
It seems that var('z') makes sage think z is real.
simplify(real(z)) returns z and simplify(imag(z)) returns 0.
This is #6862 on trac:
http://trac.sagemath.org/sage_trac/ticket/6862
It's one of the major bugs remaining in the maxima interface.
Cheers,
Burcin
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[sage-support] Re: real part incorrectly simplified away
On Feb 1, 12:01 pm, Burcin Erocal bur...@erocal.org wrote:
On Mon, 31 Jan 2011 14:19:51 -0800 (PST)
Michael Beeson profbee...@gmail.com wrote:
It seems that var('z') makes sage think z is real.
simplify(real(z)) returns z and simplify(imag(z)) returns 0.
This is #6862 on trac:
http://trac.sagemath.org/sage_trac/ticket/6862
It's one of the major bugs remaining in the maxima interface.
Cheers,
Burcin
I would like to add what is perhaps a related issue.
If I do
var('a')
assume(a, 'real')
I would like to have the imaginary part returned as zero. However
imag(a)
returns imag(a), as though it is a symbol, I believe because
type(imag(a) returns type 'sage.symbolic.expression.Expression'.
To be consistent with the assumption, though, I think that iimag(a)
should return zero.
Jeff
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