Hi Tim,
this is tricky: You need a range-style with an none-default usename
setting (i.e. it's not obvious, but we already thought about such a
case). Here a small modified version of the graphstyles/errorbar
example:
from pyx import *
g = graph.graphxy(width=8)
g.plot(graph.data.file("errorbar.dat", x=1, y=2, error=2,
derror=3),
[graph.style.histogram(), graph.style.range(usenames={"y":
"error"}), graph.style.errorbar()])
g.writePDFfile("errorbar")
HTH,
André
Am 29.04.2008 um 00:58 schrieb Tim Head:
> Hi
>
> I would like to plot a histogram with errorbars. I tried the obvious
> way, by specifying dy values but that has unexpected results.
>
> A quick google didn't yield anything promising ;(
>
> The following script demonstrates my problem and my current work
> around.
>
> import pyx
>
> d = [1,2,3,4,5,6,7,8,9,10]
>
> data = pyx.graph.data.values(x=d, y=d, dy=[2]*len(d), title="data")
>
> g = pyx.graph.graphxy(width=8, key=pyx.graph.key.key())
> g.plot(data, [pyx.graph.style.histogram()])
> g.writePDFfile("pyx-test")
>
> # work around
> data = pyx.graph.data.values(x=d, y=d, title="data")
> # empty title to suppres it appearing in the key
> errors = pyx.graph.data.values(x=d, y=d, dy=[2]*len(d), title="")
>
> g = pyx.graph.graphxy(width=8, key=pyx.graph.key.key())
> g.plot(data, [pyx.graph.style.histogram()])
> g.plot(errors, [pyx.graph.style.errorbar()])
> g.writePDFfile("pyx-test")
>
> All ideas welcome ;]]
>
> tim
>
> --
> http://tim.jottit.com/
>
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