ColorBar ignore range with blank color

Question

sara_game7 2016-10-6

1
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评论： Anil Kumar 2021-12-10

Hello!,

I have created one graph with colorbar ignoring certain range. I have replaced values in specified range for NAN values and automatically these values are displayed in blank, but not in the color bar. I would like to see the specified range in blank in the colorbar.

I have tried to modify the map matrix colors to [1 1 1] looking for the values considering nº of values and color bar limits, but is not working because I do not know how find the exactly position (rows) of the map matrix. The next code is not working with precision.

if threshold >0
    threshold=1/(colourbar_limit/threshold);
    min=round((length(map)/2)-((length(map)/2)*(threshold)));
    max=round((length(map)/2)+((length(map)/2)*(threshold)));
    for i=min:max
        map(i,:) = [1 1 1];    % set that position to white (light green around zero)
    end
else  
end

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Answer 1

Marc Jakobi 2016-10-7

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I had a similar problem once. I can't find the script I had the solution in, but what I did was set the NaNs to a number smaller than the smallest number in the data, e. g.

data(isnan(data)) = -1;

or

data(isnan(data)) = min(data{:)) - 1;

Then I defined my colormap by adding white at the beginning:

customcmap = [(1 1 1); jet]; %you can use any colormap instead of jet here
colormap(customcmap)

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Marc Jakobi 2016-10-7

在 MATLAB Online 中打开

Then I would change the values between -5 to 5 to -101 and then change the TickLabels of the colorbar

data(data >= -5 && data <= 5) = -101
cmap = [(1 1 1); jet];
colormap(cmap)
cbr = colorbar;
tl = get(cbr, 'TickLabels');
tl{1} = 'NaN' % blank range indicator as string
set(cbr, 'TickLabels', tl)