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
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,


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);
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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