Suresh Pillai wrote:
> I am using imshow to visualise matrices. When I use align='upper'
> (default), the origin is still displayed in the lower left corner on the
> axes - i.e. the y-axis is wrong. The data is plotted correctly with the
> origin in the upper left corner.
>
> Seems to be a bug?
No, this is just the way it was designed and has always been. You can
use the "extent" kwarg to control the axes:
* origin is either upper or lower, which indicates where the [0,0]
index of the array is in the upper left or lower left corner of
the axes. If None, default to rc image.origin
* extent is a data xmin, xmax, ymin, ymax for making image plots
registered with data plots. Default is the image dimensions
in pixels
See the code in axes.spy() for an example of how to get what you want
using imshow and the extent kwarg; or use pylab.matshow instead of
pylab.imshow. (Probably there should be an axes.matshow convenience
method, with pylab.matshow as a wrapper that autogenerates a figure if
needed. But at the moment there isn't.)
Eric
>
> Cheers,
> Suresh
>
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