Re: [Matplotlib-users] Scatter legend with colored marker
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()
---
--
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Re: [Matplotlib-users] Scatter legend with colored marker
On Thu, Aug 5, 2010 at 2:48 AM, Jorge Scandaliaris
jorgesmbox...@yahoo.eswrote:
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
--
The Palm PDK Hot Apps Program offers developers who use the
Plug-In Development Kit to bring their C/C++ apps to Palm for a share
of $1 Million in cash or HP Products. Visit us here for more details:
http://p.sf.net/sfu/dev2dev-palm___
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