Why is colormap only applied to the last subplot?

Question

Reza Yahyaei 2020-7-31

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/573337-why-is-colormap-only-applied-to-the-last-subplot

编辑： Reza Yahyaei 2020-7-31

Hello. I made a custom (circular) colormap for phase angles. However, in the loop, only the last subplot takes the change. What is the issue in this code? Thanks!

figure
for i = 1:5
    
    subplot(2, 5, i);
    topoplot(double(squeeze(pophmat(timeidx, i, :, 1))), EEG.chanlocs, ...
             'style', 'map', 'electrodes', 'off');
    title(['Pwr: ' num2str(frequencies(i)) 'Hz, 180ms']);
    
    subplot(2, 5, i+5);
    topoplot(double(squeeze(pophmat(timeidx, i, :, 2))), EEG.chanlocs, ...
             'style', 'map', 'electrodes', 'off');
    title(['Phs: ' num2str(frequencies(i)) 'Hz, 180ms']);
    colormap(gca, circular_jet); % Applying the custom colormap to the current subplot
    
end

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Serhii Tetora 2020-7-31

becase current axes, that you get with gca is the last subplot

Reza Yahyaei 2020-7-31

编辑：Reza Yahyaei 2020-7-31

But I tried this also with a handle h = subplot(... and the result was the same. Btw, by the last subplot I mean the last one in the whole set (10th subplot) not the second subplot in each loop.

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Answer 1

Reza Yahyaei 2020-7-31

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/573337-why-is-colormap-only-applied-to-the-last-subplot#answer_473416

编辑：Reza Yahyaei 2020-7-31

I debugged my own code and realized that the issue is with the topoplot function. After applying the colormap, when it goes to plot the next one with topoplot, it reverses all the previous changes in colormaps because apparently topoplot implicitly applies its own colormap to the whole figure. Therefore only the last subplot avoids the reset.