File: legend_scatter.py

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matplotlib 1.1.1~rc2-1
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#!/usr/bin/env python
from pylab import *

N=1000

props = dict( alpha=0.5, edgecolors='none' )

handles = []
colours = ['red', 'green', 'blue', 'magenta', 'cyan', 'yellow']
colours = ['red', 'green', 'blue']
for colour in colours:
    x, y = rand(2,N)
    s = 400.0 * rand(N)
    handles.append(scatter(x, y, c=colour, s=s, **props))

legend(handles, colours)
grid(True)

show()