colorbar graph exceeding matrix values

Question

Kitt 2024-8-12，16:37

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https://ww2.mathworks.cn/matlabcentral/answers/2144779-colorbar-graph-exceeding-matrix-values

编辑： Matt J 2024-8-12，19:10

So I'm plotting a 4D matrix, called Ft, that ranges from 0-1, but when I graph it and add a colorbar, it's showing 0-2 for physical states 4-15, and (-1)-1for physical state 1-3

physical states 1-3 are 0 for every timestep in the matrix Ft, so that first graph makes sense. Why does the colorbar range change for the other graphs?

Here's the code for the graphs. Let me know if more code is needed to create the actual Ft matrix. [[ my entire code would be needed in order to create this matrix ]]

%the setup of Ft is Ft(state,est of patch1,est of patch2,timestep)
B = permute(Ft,[2 3 1 4]);  
for state= 1:15
  figure(state)
  sgtitle(['physical state  =  ' num2str(state)])
  time = 1;
    subplot(4,5,time)
    imagesc(B(:,:,state,time))
    title(['timestep : ' num2str(time)])
    xlabel('est. of patch 2 quality');
    ylabel('est. of patch 1 quality');
    set(gca,'ydir','normal')
    
  for time = 2:19
    subplot(4,5,time)
    imagesc(B(:,:,state,time))
    title(num2str(time))
    set(gca,'ydir','normal')
  for time = 20
    subplot(4,5,time)
    imagesc(B(:,:,state,time))
    title(num2str(time))
    set(gca,'ydir','normal')
    colormap hot
    colorbar 
     
hold on 
    
  end
  end
end

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Voss 2024-8-12，18:15

The colorbar only applies to the 20th subplot.

For example, in the case of state == 7, the colorbar tells us that Ft(7,:,:,20) is 1 everywhere; the colorbar says nothing about Ft(7,:,:,1), Ft(7,:,:,2), or the value of Ft at any other time.

Kitt 2024-8-12，18:24

ooooh I see, when adding a colorbar to other timesteps, it completely changes the range! Using the other commenters suggestion of the restriction for imagesc I'm able to standardize all the graphs now. Thanks!

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Answer 1

Matt J 2024-8-12，17:58

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2144779-colorbar-graph-exceeding-matrix-values#answer_1497979

编辑：Matt J 2024-8-12，19:10

在 MATLAB Online 中打开

You haven't attached Ft for us to examine, so we have no way to verify your claim that the data is bounded to [0,1]. Regardless, you can explicitly bound the colorbar range by using imagesc's clim argument, e.g.,

imagesc(B(:,:,state,time) ,[0,1])