Hi there -
I'm using the latest stable pylab/matplotlib (0.98.3) via OS X 10.5.4. I am
plotting a simple array of data, and I'm getting some strange behavior when
I try to add a legend to the plot.
First, the plot without the legend:
f=figure(1)
title("Equilibrium Concentration vs. Equivalence Ratio")
line1 = plot(phi,xeq[1])
show()
This works fine. However, when I try to add a legend, I get an error. I
add this:
f=figure(1)
title("Equilibrium Concentration vs. Equivalence Ratio")
line1 = plot(phi,xeq[1])
f.legend(line1,('CO2'),loc=(0.8,0.8))
show()
And it gives me an error because of the second argument to f.legend:
---------------------------------------------------------------------------
ValueError Traceback (most recent call last)
/Users/charles/Documents/school/combustion/problem-2-52/adiabatic.py in
<module>()
111 title("Equilibrium Concentrations vs. Equivalence Ratio")
112 line1=plot(phi,xeq[1])
--> 113 f.legend(line1,('CO2'),loc=(0.8,0.8))
114 show()
115
/Library/Python/2.5/site-packages/matplotlib-0.98.3-py2.5-macosx-10.3-i386.egg/matplotlib/figure.pyc
in legend(self, handles, labels, *args, **kwargs)
841 """
842 handles = flatten(handles)
--> 843 l = Legend(self, handles, labels, *args, **kwargs)
844 self.legends.append(l)
845 return l
/Library/Python/2.5/site-packages/matplotlib-0.98.3-py2.5-macosx-10.3-i386.egg/matplotlib/legend.pyc
in __init__(self, parent, handles, labels, loc, numpoints, prop, pad,
markerscale, labelsep, handlelen, handletextsep, axespad, shadow)
180 textleft = left+ self.handlelen+self.handletextsep
181 self.texts = self._get_texts(labels, textleft, top)
--> 182 self.legendHandles = self._get_handles(handles, self.texts)
183
184 self._drawFrame = True
/Library/Python/2.5/site-packages/matplotlib-0.98.3-py2.5-macosx-10.3-i386.egg/matplotlib/legend.pyc
in _get_handles(self, handles, texts)
246 # centered marker proxy
247
--> 248 for handle, label in safezip(handles, texts):
249 if self.numpoints > 1:
250 xdata = np.linspace(left, left + self.handlelen,
self.numpoints)
/Library/Python/2.5/site-packages/matplotlib-0.98.3-py2.5-macosx-10.3-i386.egg/matplotlib/cbook.pyc
in safezip(*args)
899 for i, arg in enumerate(args[1:]):
900 if len(arg) != Nx:
--> 901 raise ValueError(_safezip_msg % (Nx, i+1, len(arg)))
902 return zip(*args)
903
ValueError: In safezip, len(args[0])=1 but len(args[1])=3
WARNING: Failure executing file: <adiabatic.py>
I don't understand why this doesn't work, because I should be able to give a
label of arbitrary length. It doesn't work when I replace single quotes
with double quotes, either. But I change the length to 1, like it wants:
f=figure(1)
title("Equilibrium Concentrations vs. Equivalence Ratio")
line1=plot(phi,xeq[1])
f.legend(line1,('C'),loc=(0.8,0.8))
show()
Which creates a plot, with a legend, but when I move the mouse over the
plot, it has the "thinking" cursor (hourglass). I can't close the window
using the buttons in the upper left hand corner, I can't close it using
close(1), and I can't close it using close('all'). I end up having to run
'killall Python' from a command line.
I can get the plot with the legend to work, albeit with only ONE character
for the name, by running (from Python)
f=figure(1)
title("Equilibrium Concentrations vs. Equivalence Ratio")
line1=plot(phi,xeq[1])
f.legend(line1,('C'),loc=(0.8,0.8))
(without the show() command) in the script, then running show() when the
script is done, and I don't get the "thinking" cursor.
Note: I have also used the function figlegend() with the exact same
results/problems.
1. How can I give a legend name with a length of more than 1 character?
What am I doing wrong?
2. What is causing the behavior with the thinking cursor?
Also, ultimately I would like to make a plot with 30+ species, instead of
just CO2. Is there a way to do this other than doing the following?
line1 line2 line3 ........ =
plot(phi,xeq[1],phi,xeq[2],phi,xeq[3],...........)
f.legend((line1,line2,...........),(name[0],name[1],name[2],................),loc=(0.8,0.8))
Thanks ahead of time for any suggestions or hints.
Charles
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