On 7/11/07, Ted Kosan <[EMAIL PROTECTED]> wrote:
>
> I would like to plot a list of values on a semi log graph and I think
> that matplotlib.pylab.semilogy has the functionality I need. Can
> someone post a short example of the best way to access
> matplotlib.pylab.semilogy from within SAGE?
>
> I have been studying SAGE's plot module's source code for clues on how
> to do this but I have not had much luck so far.
Fortunately, because of some well-thought out ideas in designing the
SAGE notebook (thanks Tom Boothby!) It is very easy to produce graphics
that embed in the notebook even if SAGE doesn't have any explicit support
for them. For example, you can easily do *any* example in the entire
matplotlib documentation directly as follows (this is just the first complicated
example from the matplotlib examples):
# -------------
from pylab import *
t = arange(0.0, 2.0, 0.01)
s = sin(2*pi*t)
plot(t, s, linewidth=1.0)
xlabel('time (s)')
ylabel('voltage (mV)')
title('About as simple as it gets, folks')
grid(True)
savefig('sage.png')
# --------------
(I posted this at
https://sage.math.washington.edu:8103/home/pub/1463/
)
The key point above is that we call savefig to save the current maplotlib
image to a file -- when done in the notebook, it will notice that a new
file was created and display it immediately. Presumably on the command
line it will produce an image.
I've always planned to make it a lot clearer to people that SAGE comes
standard with a complete clone implementation of matlab's 2d plotting
functionality... This should really go right in the tutorial and in the
documentation for SAGE's current plotting code.
William
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