Thank you for the immediate and extremely helpful suggestions. Changing the string to a tuple works great, and I did not think about using the “label” keyword in plot. I think this will greatly simplify the plotting.
Thanks again for the “instant gratification”. 
Charles
···
==========
The 2nd Law of Thermodynamics… If you think things are a mess now, JUST WAIT!
On Tue, Sep 16, 2008 at 3:28 PM, Jae-Joon Lee <lee.j.joon@…287…> wrote:
(‘CO2’) is not a tuple but still a single string.
You may use a list [‘CO2’] or put an extra “,” to make it a tuple (‘CO2’,).
And, you may consider to use the “label” keyword with your plot command.
IHTH,
-JJ
On Tue, Sep 16, 2008 at 5:09 PM, charles reid <charlesreid1@…287…> wrote:
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
()
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.handletextsep181 self.texts = self._get_texts(labels, textleft, top)→ 182 self.legendHandles = self._get_handles(handles, self.texts)
183184 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 proxy247→ 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)903ValueError: 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.
- How can I give a legend name with a length of more than 1 character?
What am I doing wrong?
- 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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