Charles,
The legend functions needs a sequence-type object (list,etc) not a
tuple as the second argument. The following should work:
f.legend(line1,['CO2'],loc=(0.8,0.8))
Not sure about the cursor issue, see if the above solves the problem.
You should be able to add a number of plots more effectively using a for
loop:
lines = []
names = ["CO2","H2O","etc"]
for y in xeq:
lines.append( plot(phi,y) )
f.legend( lines,names,loc=(0.8,0.8) )
Cheers,
-Jonathan Helmus
charles reid wrote:
> Hi there -
>
> I'm using the latest stable pylab/matplotlib (0.98.3) via OS X 10.5.4.
> <http://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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