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

Sturla Molden sturla@molden...
Thu Jan 31 10:04:58 CST 2013


And I must apologize to the rest of you for posting this OT material on 
the SciPy dev list. I know what this list is for. Sorry for the spam :)

Sturla




On 31.01.2013 16:56, Sturla Molden wrote:
> On 31.01.2013 16:32, Frank Breitling wrote:
>
>> My experience with pcolor was that is was very slow.
>
> imshow is fast because it basically just bitblit the image. You can
> always use Python (or Cython, Fortran or C) to prepare an image from
> your 2D data and pass that to imshow.
>
> I showed you can example where I used contourf. I kind of show too, but
> I often just let the computer run for a while and prepare a bunch of PDF
> files with the spectrums. Then I can take those into e.g. Adobe
> Illustrator later on, and I will also store the wavelet data in PyTables
> (HDF5) files.
>
> If I needed to render a spectrum in "real-time", I would use imshow or
> OpenGL, and e.g. have my own Fortran 90 code prepare the displayed
> image. I might even consider to use PyOpenGL to write vertex shaders and
> have the graphics hardware do all the rendering.
>
> So it really depends on how fast you need it to be. Python code can draw
> your data with OpenGL at the full speed that your graphics hardware
> allows. Or you can settle for slower but more convenient data
> visualization methods like pcolor and contourf. Or you can do something
> in between.
>
> But as for the question you asked (how to draw a 2D historgram), pcolor
> does exactly that. I did not say it will be fast for huge data sets. I
> thought you were used to e.g. Matlab and wanted something like image or
> imagesc, and then found imshow but overlooked pcolor.
>
>
> :-)
>
>
> Sturla
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