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Editorial Team
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Asked: 2026-05-26T15:34:33+00:00

In the following minimal example, I create 1-point scatter plot and later change color

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In the following minimal example, I create 1-point scatter plot and later change color of points in loop using Collection.set_color. If I set the color(s) the first time scatter is called, set_color will not change its face color (only edge color), whereas if I don’t specify it when the scatterplot is created, face color will change according to set_color.

from pylab import *
from numpy import *
coll=scatter([0],[0],s=500,c=[.1]) # omit c=[.1] here to have face color changing later
ion(); show()
for a in linspace(.1,.9):
    coll.set_color(coll.get_cmap()(a))
    draw()

Is that a bug, or am I missing something in the documentation?

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1 Answer

  1. Editorial Team

    I would say it is a bug/limitation of that matplotlib version.
    I tried the code with:

    matplotlib 1.0.1 (ActivePython 2.6.7, win7 64bit)           --> reproduced the behavior
matplotlib 1.1.0.dev (ActivePython 3.2.2, winXP, 32bit)     --> works as expected

    There is also a comment from Avaris saying he gets expected behavior with mpl 1.1.0 (win7, 32bit)

    So I recommend you to upgrade your installation if this is possible

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