I'm having a bit of trouble labeling some graphs of
mine. The first one is:
from pyx import *
from pyx.graph import axis
g = graph.graphxy(width=8,
x=axis.linear(min=1, max=10, title="$\tau$"),
y=axis.linear(title="$R(\sqrt{0.5\tau})$"))
g.plot(graph.data.function("y(x)=
sqrt(0.5*x)/((sqrt(0.5*x)
+0.5)*(sqrt(0.5*x)+x))",points=500))
g.finish()
g.writeEPSfile("derivatives_opt_1")
The problem is that rather than showing the Greek
letter tau the output is 5au. My understanding was I
could just use LaTeX labels directly, but perhaps I'm
doing something wrong?
The second is a similar problem. I have another graph:
from pyx import *
from pyx.graph import axis
g = graph.graphxy(width=8,
x=axis.linear(min=1, max=10, title="$\tau$"),
y=axis.linear(title="$\frac{\sqrt{0.5\tau}}{\sqrt{0.5\tau}+\tau}$"))
g.plot(graph.data.function("y(x)=sqrt(0.5*x)/(sqrt(0.5*x)+x)",points=500))
g.finish()
g.writeEPSfile("derivatives_opt_2")
where here I actually want use a fraction in the
label. Trying to do so python becomes very unhappy
with me
bsd% python derivatives_opt_2.py
Traceback (most recent call last):
File "derivatives_opt_2.py", line 10, in <module>
g.finish()
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/graph.py",
line 268, in finish
self.doaxes()
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/graph.py",
line 491, in doaxes
self.dolayout()
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/graph.py",
line 475, in dolayout
self.doaxiscreate(axisname)
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/graph.py",
line 216, in doaxiscreate
self.axes[axisname].create()
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/axis/axis.py",
line 565, in create
self.canvas = self.axis.create(self.data,
self.positioner, self.graphtexrunner, self.errorname)
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/axis/axis.py",
line 228, in create
return _regularaxis._create(self, data,
positioner, graphtexrunner, self.parter, self.rater,
errorname)
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/axis/axis.py",
line 198, in _create
variants[0].storedcanvas = layout(variants[0])
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/axis/axis.py",
line 133, in layout
self.painter.paint(canvas, data, self, positioner)
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/axis/painter.py",
line 253, in paint
_title.paint(self, canvas, data, axis, axispos)
File
"/usr/local/lib/python2.5/site-packages/pyx/graph/axis/painter.py",
line 104, in paint
title = canvas.text_pt(x, y, axis.title,
titleattrs)
File
"/usr/local/lib/python2.5/site-packages/pyx/canvas.py",
line 319, in text_pt
return self.insert(self.texrunner.text_pt(x, y,
atext, *args))
File
"/usr/local/lib/python2.5/site-packages/pyx/text.py",
line 1222, in text_pt
return self.text(x * unit.t_pt, y * unit.t_pt,
expr, *args, **kwargs)
File
"/usr/local/lib/python2.5/site-packages/pyx/text.py",
line 1201, in text
self.finishdvi(ignoretail=1)
File
"/usr/local/lib/python2.5/site-packages/pyx/text.py",
line 1044, in finishdvi
self.execute(None, self.defaulttexmessagesend +
self.texmessagesend)
File
"/usr/local/lib/python2.5/site-packages/pyx/text.py",
line 1036, in execute
raise TexResultError("unhandled TeX response
(might be an error)", self)
pyx.text.TexResultError: unhandled TeX response (might
be an error)
The expression passed to TeX was:
\end%
After parsing the return message from TeX, the
following was left:
*[1]
Am I doing something wrong here, or is it just not
possible to create labels using fractions?
All help is greatly appreciated as always.
Thanks,
-Daniel
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