set alpha channel for pyplot objects?

Question

In R, you can set the alpha channel by

rgb(r=.1,g=.5,b=.5,alpha=.5,max=1)

for any object that takes a color argument. patch objects in pyplot have a set_alpha method, but can this be done for lines on a plot, for instance? like pyplot.plot(x,y,color=???) or h = pyplot.plot(x,y) and do something with h.

ev-br · Accepted Answer · 2011-12-10 19:19:32Z

10

plt.plot(x,y,'ro-',alpha=0.3)

if you want to mix up your own color, you can pass a hex value or an rgb tuple http://matplotlib.sourceforge.net/api/colors_api.html

answered Dec 10, 2011 at 19:19

ev-br

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hatmatrix · Accepted Answer · 2011-12-10 15:20:35Z

3

Appears that

h = plt.plot(x,y)

returns a list of matplotlib.lines.Line2D objects in h even if there is one element plotted, so h[0].set_alpha() is the method to use.

answered Dec 10, 2011 at 15:20

hatmatrix

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