On Thu, Aug 5, 2010 at 2:48 AM, Jorge Scandaliaris
<jorgesmbox...@yahoo.es>wrote:
> Benjamin Root <ben.r...@...> writes:
> >
> <snip>
> > Probably not directly, but I hadn't thought about that before. For a set
> of
> > scatter points that are colored by values, what should the legend show?
> In
> > other words, what does it *mean* for there to be a legend for points that
> are
> > colored in a potentially non-uniform manner?So, maybe this is desired
> behavior
> > (but possibly by accident)?
> > Thanks for your help,
> > Ben Root
>
> I thought for a moment that legend was using the color of the first point
> in the
> set, but a quick test reveals that no matter what colormap you specify, the
> marker color inside the legend is blue. BTW, I think I've found another
> thing
> related to legend() and scatter plots: the 'numpoints' keyword argument to
> legend is not respected, as showed in the example pasted below,
>
> Jorge
>
> -------
> import numpy as np
> import matplotlib as mpl
> import matplotlib.pyplot as plt
>
> data0 = np.random.rand(10,2)
> data1 = np.random.rand(10,2)
> data2 = np.random.rand(10,2)
> data = [data0, data1, data2]
>
> fig, ax = plt.subplots(1,1)
> norm = mpl.colors.Normalize(0,len(data))
> cmap = mpl.cm.afmhot
>
> sc = []
> labels = []
> for i,d in enumerate(data):
> sc.append(ax.scatter(d.T[0], d.T[1], c=np.ones(d.shape[0])*i,
> norm=norm, cmap=cmap))
> labels.append('data set ' + str(i))
> ax.legend(sc, labels, numpoints=1)
> plt.show()
> -------
>
>
Yes, this was found a little while back and I believe it was fixed for v1.0.
Ben Root
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