Re: [Matplotlib-users] Labeling Contours

[Alexa V. <ale...@gm...>]

Hi Eric,

Thanks for your help, I'm still really new to python and matplotlib. I've
got my labels defined but now I'm having another problem with the
formatting.

I'm doing -

CS1.level=[14.07, 14.27]

plt.clabel(CS1,CS1.level[::2],inline=True,fmt='OIII',fontize=14)


Where I get a type error that says that not all string arguments are
getting converted during formatting. This is the full error,

Traceback (most recent call last):

  File "ContourAttempt.py", line 81, in <module>

    plt.clabel(CS1,CS1.level[::2],inline=True,fmt='OIII',fontize=14) #
Something wrong with formmating

  File "/Users/alexavillaume/src/matplotlib/lib/matplotlib/pyplot.py", line
2176, in clabel

    ret = ax.clabel(CS, *args, **kwargs)

  File "/Users/alexavillaume/src/matplotlib/lib/matplotlib/axes.py", line
7326, in clabel

    return CS.clabel(*args, **kwargs)

  File "/Users/alexavillaume/src/matplotlib/lib/matplotlib/contour.py",
line 217, in clabel

    self.labels(inline,inline_spacing)

  File "/Users/alexavillaume/src/matplotlib/lib/matplotlib/contour.py",
line 624, in labels

    lw = self.get_label_width(lev, self.labelFmt, fsize)

  File "/Users/alexavillaume/src/matplotlib/lib/matplotlib/contour.py",
line 284, in get_label_width

    lev = self.get_text(lev, fmt)

  File "/Users/alexavillaume/src/matplotlib/lib/matplotlib/contour.py",
line 344, in get_text

    return fmt%lev

TypeError: not all arguments converted during string formatting



On Wed, Feb 15, 2012 at 10:34 AM, Eric Firing <ef...@ha...> wrote:

> On 02/15/2012 10:15 AM, Alexa Villaume wrote:
> > Hi Everybody,
> >
> >
> > I'm trying to label the contours of my contour plot following this
> > example -
> >
> >
> http://matplotlib.sourceforge.net/examples/pylab_examples/contour_label_demo.html
> >
> >
> > My actual code looks like this -
> >
> >
> > import matplotlib
> >
> > matplotlib.use('PDF')
> >
> > frompylab import*
> >
> > import numpy as np
> >
> >
> > # Define the surface of the plot
> >
> > metals=np.arange(-3.0, 1.1, 0.1)
> >
> > U=np.arange(-6.0, 0.25, 0.25)
> >
> >
> > # Create the arrays that the data will be stored in
> >
> > o3=np.zeros([25,41])
> >
> > o2=np.zeros([25,41])
> >
> > c3=np.zeros([25,41])
> >
> > mg2=np.zeros([25,41])
> >
> > c3=np.zeros([25,41])
> >
> > si2=np.zeros([25,41])
> >
> > s3=np.zeros([25,41])
> >
> >
> > CS=plt.contourf(metals, U, o3, levels=[o3col-nsig*o3sig,
> > o3col+nsig*o3sig], alpha=0.50, colors='#f88534')
> >
> > CS=plt.contourf(metals, U, o2, levels=[o2col-nsig*o2sig,
> > o2col+nsig*o2sig], alpha=0.50, colors='#f2f34f')
> >
> > CS=plt.contourf(metals, U, c3, levels=[c3col-nsig*c3sig,
> > c3col+nsig*c3sig], alpha=0.50, colors='#93d3f3')
> >
> > CS=plt.contourf(metals, U, mg2, levels=[mg2col-nsig*mg2sig,
> > mg2col+nsig*mg2sig], alpha=0.50, colors='#ff536d')
> >
> > CS=plt.contourf(metals, U, s3, levels=[s3col-nsig*s3sig,
> > s3col+nsig*s3sig], alpha=0.50, colors='#83c460')
> >
> > CS=plt.contourf(metals, U, si2, levels=[si2col-nsig*si2sig,
> > si2col+nsig*si2sig], alpha=0.50, colors='black')
> >
> >
> >
> > # Trying to label the contours
> >
> >
> > fmt = {}
> >
> > strs = [ 'O III', 'O II', 'C III', 'Mg II', 'S III', 'Si II']
> >
> > for l,s in zip(levels, strs):
> >
> > fmt[l] = s
> >
> > plt.clabel(CS,levels[::2],inline=True,fmt=fmt,fontize=14)
> >
> >
> > But I get an error that says that "levels" is not defined. What should I
> do?
>
> Define levels!
>
> In your call to clabel, you are referencing a global "levels" which you
> did not define; what you did define is the levels attribute of each CS
> object.  So probably what you want is something like:
>
> plt.clabel(CS, CS.levels[::2],inline=True,fmt=fmt,fontize=14)
>
> but you need one such call for each CS you create, if you want all of
> them labeled.
>
>
> Eric
>
> >
> >
> > Thanks!
> >
> > Alexa
> >
> >
> >
> >
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