Re: [Matplotlib-users] Scatter legend with colored marker
Jae-Joon Lee lee.j.j...@... writes: snip In recent versions, there is a separate parameter : scatterpoints. So check your document. ax.legend(sc, labels, scatterpoints=1) Regards, -JJ Great! It works fine with 1.0.0 Jorge -- This SF.net email is sponsored by Make an app they can't live without Enter the BlackBerry Developer Challenge http://p.sf.net/sfu/RIM-dev2dev ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
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
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Re: [Matplotlib-users] Scatter legend with colored marker
Jorge Scandaliaris jorgesmbox...@... writes: Hi, I am adding several scatter plots to the same axis, each having a specific color. When I call legend on the axis it correctly picks all scatter plots with their symbols and labels, but it doesn't pick up the color. The example below demonstrates this. What I would like to do is to have in the legend the marker its color matching that of the set it represents. How would I do this? Answering my own question, I found a way to achieve what I wanted by using a proxy artist as suggested in this thread: http://thread.gmane.org/gmane.comp.python.matplotlib.general/20995/focus=20999 Maybe there's a better approach. I certainly would love legend to pick up on the color used in the scatter plot by its own. Jorge -- 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 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Scatter legend with colored marker
On Wed, Aug 4, 2010 at 10:00 AM, Jorge Scandaliaris jorgesmbox...@yahoo.eswrote: Jorge Scandaliaris jorgesmbox...@... writes: Hi, I am adding several scatter plots to the same axis, each having a specific color. When I call legend on the axis it correctly picks all scatter plots with their symbols and labels, but it doesn't pick up the color. The example below demonstrates this. What I would like to do is to have in the legend the marker its color matching that of the set it represents. How would I do this? Answering my own question, I found a way to achieve what I wanted by using a proxy artist as suggested in this thread: http://thread.gmane.org/gmane.comp.python.matplotlib.general/20995/focus=20999 Maybe there's a better approach. I certainly would love legend to pick up on the color used in the scatter plot by its own. Jorge Hmm, this definitely looks like a bug. If I explicitly state what color I want using the color keyword instead of using 'c' and 'norm', then everything works properly. Digging through the code, 'color' gets used right after the creation of the collection object by calling the .update() function, which in turn calls the .set_color() function which calls the set_facecolor() and set_edgecolor() functions. However, when using 'c' and 'norm', and having 'c' contain an array that is the same length as the data, causes colors to be set to None during the creation of the polygon collection. After the collection creation, set_array(), set_cmap() and set_norm() are called, which allows for the scatter graph to be colored correctly upon draw. However, I suspect that when the legend is being created, the legend uses whatever the face/edge color that was set for the collection, which probably isn't set yet and won't be until a draw is performed. 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___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Scatter legend with colored marker
Benjamin Root ben.r...@... writes: snip Hmm, this definitely looks like a bug. If I explicitly state what color I want using the color keyword instead of using 'c' and 'norm', then everything works properly. I can't tell if this is a bug or not, but the trick of using a color directly is an even simpler workaround than the one I used. Thanks. Jorge -- 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 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Scatter legend with colored marker
Benjamin Root ben.r...@... writes: snip Hmm, this definitely looks like a bug. Should I fill a bug report about this? Jorge -- 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 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Scatter legend with colored marker
On Wed, Aug 4, 2010 at 3:01 PM, Jorge Scandaliaris jorgesmbox...@yahoo.eswrote: Benjamin Root ben.r...@... writes: snip Hmm, this definitely looks like a bug. Should I fill a bug report about this? Jorge Yes, please do, and then mention which bug report you filed to this thread. 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___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Scatter legend with colored marker
Benjamin Root ben.r...@... writes: snip Yes, please do, and then mention which bug report you filed to this thread. Ben Root Done. Bug number is 3039678 Could this behavior be due to the fact that scatter() accepts sequences for setting the color of each point individually? Maybe I am way off, but who knows... Jorge -- 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 ___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
Re: [Matplotlib-users] Scatter legend with colored marker
On Wed, Aug 4, 2010 at 3:52 PM, Jorge Scandaliaris jorgesmbox...@yahoo.eswrote: Benjamin Root ben.r...@... writes: snip Yes, please do, and then mention which bug report you filed to this thread. Ben Root Done. Bug number is 3039678 Could this behavior be due to the fact that scatter() accepts sequences for setting the color of each point individually? Maybe I am way off, but who knows... Jorge 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 -- 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___ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
