Re: [Matplotlib-users] scatter plot individual alpha values

[Warren W. <war...@en...>]

On Wed, Aug 8, 2012 at 3:34 PM, Gustavo Goretkin <gus...@gm...
> wrote:

> I can use the scatter function to plot an array of points and give a
> corresponding array of colors to set those points. Is it possible to
> do the same thing with alpha values?
>
> Right now, I'm restoring to calling plot with an 'o' marker for each
> individual point, which is slow.
>
>

The 'color' argument of the 'scatter' function can take an array of
(r,g,b,alpha) values:


In [23]: x = array([0, 1, 2, 3])

In [24]: y = array([0, 1, 1, 2])

In [25]: c = array([[0,0,1,1], [0,0,1,0.5], [0,1,0,0.5], [1,0,1,.9]])

In [26]: scatter(x, y, color=c)
Out[26]: <matplotlib.collections.PathCollection at 0x898adf0>


Warren







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