[SciPy-Dev] 2D histogram: request for plotting variable bin size

Frank Breitling fbreitling@aip...
Thu Jan 31 09:00:12 CST 2013

Hi Skipper,

I would like to use Python for plotting dynamic radio spectra e.g. as 
found at


(Image is also attached).
Given the high resolution in time and frequency I believe broken_barh is 
not suited.

But thanks for your suggestion


On 31.01.2013 15:17, Skipper Seabold wrote:
> On Thu, Jan 31, 2013 at 9:01 AM, Frank Breitling <fbreitling@aip.de 
> <mailto:fbreitling@aip.de>> wrote:
>     Hello,
>     http://docs.scipy.org/doc/numpy/reference/generated/numpy.histogram2d.html
>     explains the usage of 2D histograms.
>     Although it is possible to construct 2D histograms with a variable bin
>     size, there is no simple way to plot them.
>     Therefore I would like to request an implementation to imshow that
>     allows the visualization of 2D histograms with variable bin size. I
>     imagine a syntax like
>     imshow(historgram2d, xedges=xedges, yedges=yedges)
>     where xedges and yedges are the bin edges along the x- and y-axis.
>     I have attached a short program and its output which constructs a
>     numpy.historgram2d with variable bin width (xedges=[0,1,3]) and shows
>     its bin content with imshow.
>     I would highly appreciate if imshow would be extended to represent the
>     histogram correctly.
>     If there is an alternative solution, I would be interested to learn
>     about it as well.
> This may be a discussion for matplotlib-user, but have you had a look 
> at trying to use broken_barh for your needs?
> http://matplotlib.org/examples/pylab_examples/broken_barh.html
> Skipper
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