Hi,
I often use matplotlib directly (for various reasons) in sage.
Unfortunately, a common error that crops up is matplotlib's pdf backend has
difficulty with Sage's wrapped integer and float representations.
i.e.
sage: import pylab as pl
pl.plot([1,2,3]sage: pl.plot([1,2,3], linewidth=3.5)
[<matplotlib.lines.Line2D object at 0x10d57aed0>]
sage: pl.savefig
pl.savefig
sage: pl.savefig('/tmp/foo.pdf')
will generate an exception:
/Applications/Sage-4.6.2-OSX-64bit-10.6.app/Contents/Resources/sage/local/lib/python2.6/site-packages/matplotlib/backends/backend_pdf.pyc
in pdfRepr(obj)
207 raise TypeError, \
208 "Don't know a PDF representation for %s objects." \
--> 209 % type(obj)
210
211 class Reference(object):
TypeError: Don't know a PDF representation for <type
'sage.rings.real_mpfr.RealLiteral'> objects.
[and likewise for sage integers].
This error can be fixed by wrapping all the literals in int() and float()
conversions which is cumbersome. I would like to make a cleaner fix but I
was after some advice about the best way to go about this. One option is to
add an extra test in backend_pdf.py in matplotlib to test float-like and
int-like objects. An alternative would be to add extra pdfRepr methods to
the Sage classes which can provide a pdf representation of class.
I'm not sure which is the more advisable approach likely to be welcomed as a
patch. Advice requested.
Jonny
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