Ploting heatmaps in function of time

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Julien Maxime
Julien Maxime 2022 年 9 月 27 日
編集済み: Adam Danz 2022 年 9 月 28 日
Hello,
I have search a solution for my problem but didn't find any that suited my problem.
Basically, I have a 3D matrix (18x17x2000) representing heatmap of a sample on the 2000 frames of the measurement. I would like to plot it all but with a slider or a cursor or whatever that could allow me to chose which frame I want to display, allowing me to easily go through my data.
I tried the VideoWriter tool but it gives really blurry and not convenient result. The goal is to keep the heatmap representation.
Thank you for your help,

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Adam Danz
Adam Danz 2022 年 9 月 27 日
編集済み: Adam Danz 2022 年 9 月 28 日
This demo produces a heatmap with random data and a slider that controls which slice of the 3rd dimension of data to plot.
Demo based on a similar solution for bar plots but uses a ValueChangingFcn to update the heatmap and title as the slider changes instead of a ValueChangedFcn which is evoked after making a change to the slider.
data = rand(20,20,2000); % data with size n*m*k
fig = uifigure();
uip = uipanel(fig,'Position', [20 100 500 300]);
heatObj = heatmap(uip, data(:,:,1));
title(heatObj, 'Frame #1');
n = size(data,3);
uis = uislider(fig,'Position',[50 50 450 3],...
'Value',1, ...
'Limits', [1,n], ...
'MajorTicks', [1, 200:200:n], ...
'MinorTicks', []);
uis.ValueChangingFcn = {@sliderChangingFcn, data, heatObj};
function sliderChangingFcn(~,event,data,heatObj)
% Update heatmap and title with new selection of data
value = round(event.Value);
heatObj.ColorData = data(:,:,value);
heatObj.Title = sprintf('Frame #%d',value);
end
Tip: set clim so the colorbar limits do not jump around as the heatmap data are updated. This is seen in the GIF below.
  7 件のコメント
Adam Danz
Adam Danz 2022 年 9 月 28 日
You may want to set clim so the colorbar limits do not jump around as you update heatmap. You can see this happening in the GIF I shared.

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