Dear Dave, first of all thanks for sending this complete minimal example. You likely wouldn't have got an timely answer by me without it.
Tuples are the right way to specify the y values. It is nice to see that you
basically already got the point. The problem comes from "value+delta" in the
adjustaxis method of the range style (graph/style.py). Both value and delta are
tuples like (0, 0.1) and (0, 0.08) and "+" adds them and creates a tuple (0,
0.1, 0, 0.08). Instead (0, 0.18) should have been created. I don't really know
how to properly fix that. Probably the possibility to provide a delta is just
not supported for split axes. (For the moment it clearly is, whether this is
acceptable. For the moment I would say so.)
Anyway, as we identified the addition to be the problem, how about specifying
the ymin and ymax value for the error bars? This runs fine, problem solved.
Here is the code:
from pyx import *
g = graph.graphxy(width=8, y=graph.axis.split())
g.plot(graph.data.points([(0.1, (0,0.1), (0,0.02), (0,0.18)),
(0.5, (0,0.2), (0,0.12), (0,0.28)),
(0.9, (0,0.3), (0,0.22), (0,0.38)),
(101, (1,0.7), (1,0.62), (1,0.78)),
(105, (1,0.8), (1,0.72), (1,0.88)),
(109, (1,0.9), (1,0.82), (1,0.98))], x=1, y=2,
ymin=3, ymax=4),
[graph.style.symbol(),graph.style.errorbar()])
g.writePDFfile("minimal")
Best,
André
Am 22.01.2011 um 20:09 schrieb Dave Willmer:
> Hi everyone,
>
> I'm having trouble getting error bars to appear on the y-axis when using a
> split y-axis, has anyone has any experience with this?
> Using the minimal example from the PyX website, I've got:
>
>
> from pyx import *
>
>
> g = graph.graphxy(width=8, y=graph.axis.split())
>
> g.plot(graph.data.points([(0.1, (0,0.1), 0.08),
>
> (0.5, (0,0.2), 0.08),
>
> (0.9, (0,0.3), 0.08),
>
> (101, (1,0.7), 0.08),
>
> (105, (1,0.8), 0.08),
>
> (109, (1,0.9), 0.08)], x=1, y=2, dy=3),
>
> [graph.style.symbol(),graph.style.errorbar()])
>
> g.writePDFfile("minimal")
>
>
>
> which is just adding a third column to the data points, and assigning it to
> dy. This works if the x-axis is split (with y-errorbars), but doesn't work
> if the y-axis is split. Also, it doesn't generate any error message - the
> graph is created, it's just missing the errorbars.
>
>
> I've tried changing the third (dy) data column to be a tuple like the
> y-column, ie:
>
>
> g.plot(graph.data.points([(0.1, (0,0.1), (0,0.08)), ...
>
>
> however this throws the error
>
>
> File "/Library/Python/2.5/site-packages/pyx/graph/axis/axis.py", line 348,
> in adjustaxis
>
> assert len(value) == 2, "tuple of size two expected by bar axis '%s'" %
> errorname
>
> AssertionError: tuple of size two expected by bar axis 'y'
>
>
> Sticking in a 'print type(value), value)' statement just before this assert,
> the data going in is:
>
>
> <type 'tuple'> (0, 0.10000000000000001)
>
> <type 'tuple'> (0, 0.20000000000000001)
>
> <type 'tuple'> (0, 0.29999999999999999)
>
> <type 'tuple'> (1, 0.69999999999999996)
>
> <type 'tuple'> (1, 0.80000000000000004)
>
> <type 'tuple'> (1, 0.90000000000000002)
>
> <type 'tuple'> (0, 0.10000000000000001, 0, 0.080000000000000002)
>
>
> so obviously this is cycling over the y-data, but then when it gets to the
> dy column, it still includes the y-data (or the dy has just been added to
> it).
>
>
> Anyone any ideas?
>
> Do the dy values have to be assigned to the subcanvas individually?
>
>
> Any help is much appreciated!
>
> Also, many thanks to Andre et al for a great piece of software!
>
>
> Cheers,
>
> Dave.
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