caxis with HeatMap?

I'd like to specify the scale of the colormap used for a heat map.

It seems that something like caxis would be appropriate but it doesn't appear to work. All of the examples are for functions like surf.

Is there a way to use caxis to do this, or something else that would work for a heat map?

Thanks very much.

Answer 1

[Patrick Kalita]

Maybe I should have mentioned this in the answer to your previous question, but maybe the HeatMap object's plot method would be useful here. That method will render the heatmap image into a standard MATLAB axes. Then you can use all the standard graphics functions like colorbar and caxis with it.

For example:

data = gallery('invhess',20);
hm = HeatMap(data);
ax = hm.plot; % 'ax' will be a handle to a standard MATLAB axes.
colorbar('Peer', ax); % Turn the colorbar on
caxis(ax, [-3 10]); % Adjust the color limits

[D]

Hello. This worked beautifully, in terms of what I asked. I have a few more questions, though, that I was hoping you might be able to answer.

Some of my labels on the heat map are getting cut off, and this seems arbitrary: i.e. the last letter of a shorter label is cut off, but the longer labels are fine. Is there a way to add extra space between the plot and the labels?

How do I title the figures directly, instead of the heat maps, without using the property editor?

Finally, there appears to be a lot of grey space surrounding the plot area in the figures. Is there a way to get rid of this, short of cropping?

Thanks again for your help.

[D]

Just to clarify: the extra grey space shows up when I try to resize the figure. The heat map expands a little, but most of the expansion in the figure window is the grey space.

Also, I have code for the title, but it does this strange thing where every part of the string is on a different line.

title(ax, ['Plot ' num2str(p) ': ' list(p)]);

where p is an index for this particular plot (I'm doing these in a loop) and where list = {'abcd'; 'efgh'}.

So, it should read something like: "Plot 1: abcd" and "Plot 2: efgh". Instead I get

Plot

1

:

abcd

At first, I thought this might be because the figure is too small, but after expanding the figure, the title didn't expand to the full length of the plot area.