I would like to plot a bar graph and colour each single bar based on the intensity of the data value

When plotting a bar I would like for example that the most high bar will be black, the lower one white and the middle ones grayscale. I need this also for a 3-D bar graph (bar3). thanks all!

Answer 1

[the cyclist]

Setting the color of bar graphs is a bit tricky. Here's one way. You could set the values in the colormap to vary according to your intensity.

% the data
     v=ceil(5*ones(1,3));
     bh=bar(v);
% - change the bars' colors
     ch=get(bh,'children');
     cdm=repmat(1:numel(v),5,1);
     cdm=[cdm(:);nan];
     set(ch,'facevertexcdata',cdm);
% - play with colormaps [if size(colormap,1)=number of bars,
%                        then each bar will the color of that row of the colormap]
     colormap([[1 0 0]; ...
               [0 1 0]; ...
               [0 0 1]]);