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[TeXmacs] inline plots


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  • From: Bill Eaton <address@hidden>
  • To: address@hidden
  • Subject: [TeXmacs] inline plots
  • Date: Thu, 16 May 2013 22:17:07 -0700
I'd like to solicit suggestions on how to do inline plots in various sessions. I've already figured out how to do it in one session and it doesn't look impossible for others.

I know this is topic comes up often, but I have found few solutions. If you want to have a live mathematical scratchpad or notebook, its desirable to have live inline figures. If you're using the Maxima, Python, Octave, etc. plugin, you could invoke an extra command to insert an inline plot.

In fact, this is already possible in the Python plugin, via the ps_out function. This ps_out function points the way how we might do it in other environments. Heck, maybe it's already possible in other environments but I just don't know how. In Python, here's a minimal example:
import matplotlib
matplotlib.use('ps')
from pylab import *
fig = figure(figsize=(3,2))
ax=fig.add_subplot(111)
ax.plot([1,2,3])
ax.set_title('inline demo')
savefig('demo.eps')
ps_out('demo.eps')
So from the session, you save an EPS file and then invoke the ps_out function to display it. The displayed plot behaves pretty well. You can go back and change things, overwrite the EPS figure and then reinvoke ps_out and you get a new plot. Pure magic.

I looked inside ps_out and it just spits out the EPS file plus some extra stuff (here i use + for string concatenation:
chr(2)+'ps:'+<EPS file contents>+chr(5)

It should be easy to do the same thing in Octave. The ps_out function in Octave could be:
function ps_out(fname)
disp( [char(2); 'ps:'; fileread(fname) ; char(5)] )
endfunction

I'm dying to test this out and add more sophisticated error checking, but I don't know how to hack the appropriate file to look for the ps_out function. I think it would be in tmrepl.m. If someone can suggest the appropriate lines to modify, I would greatly appreciate and be happy to report my findings.

Likewise, it would be really swell to have a similar functionality in Maxima. There I have less of a clue, but I'm guessing the texmacs-maxima-<ver>.lisp file is the one to hack. I'm willing to do some legwork if anyone has suggestions.

--Bill Eaton



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