[Numpy-discussion] How to plot heatmap in matplotlib?
shish at keba.be
Sat Sep 24 10:36:07 EDT 2011
I'm sorry I can't help on your questions, but maybe you should ask on
matplotlib-users instead (
2011/9/24 fdu.xiaojf at gmail.com <fdu.xiaojf at gmail.com>
> Dear all,
> Heatmap (like those on the page
> http://www2.warwick.ac.uk/fac/sci/moac/students/peter_cock/r/heatmap/) is
> a frequently used type of image in microarray data analysis. However, it
> seems there are no convenient functions in matplotlib to plot heatmap
> (please correct me if I was wrong), so I'm planning to write my own.
> Let me take the heatmap by the link
> http://www2.warwick.ac.uk/fac/sci/moac/students/peter_cock/r/heatmap/scaled_color_key.pngas an example, which is produced by R.
> With my limited knowledge and expertise of matplotlib, I have the following
> questions and I hope you guys could help me.
> 1) I tend to use pcolor to draw the colormap in the central area. However,
> I've seen a lot of examples draw colormap with imshow.
> What's the difference between pcolor and imshow?
> Shall I use pcolor or imshow to produce the heatmap in the link above?
> 2) How to draw the dendrograms on the top and left of the colormap?
> I got hints from
> http://matplotlib.sourceforge.net/examples/axes_grid/scatter_hist.html on
> how to append axes to current plot, but I still have now idea how to draw
> the dengrograms.
> 3) How to draw the column side colormap (the smaller one) between the top
> dendrogram and the big colormap?
> 4) I can use colorbar to draw a colorbar, but how to place the colorbar on
> the topleft of the image just as the R heatmap does?
> 5) Any other suggestions on how to draw the heatmap?
> Thanks and any help will be greatly appreciated.
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