File: errors.py

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from random import random
from pyx import *

g = graph.graphxy(width=8, x=graph.axis.bar())
g.plot(graph.data.file("minimal.dat", xname=0, y=2, stack=3,
                       dy="1+random()", dstack="1+random()",
                       context={"random": random}),
       [graph.style.errorbar(),
        graph.style.stackedbarpos("stack"),
        graph.style.bar([color.rgb.green]),
        graph.style.range({"y": "stack"}),
        graph.style.errorbar()])
g.writeEPSfile("errors")
g.writePDFfile("errors")
g.writeSVGfile("errors")