How to match colorbar with colormap ranges in surf?

Question

Daniel Melendrez 2022-9-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1793745-how-to-match-colorbar-with-colormap-ranges-in-surf

评论： Daniel Melendrez 2022-9-6

I have a data set that contains values from a certain electronic circuit (voltages (VL), currents (io) and Load resistances (RL)). The size of these arrays is 10x10(x6). (EDITED. I mistakently said 5 times before)

The following code creates the result shown below:

for vsPtr = 1:numel(Vs)     % This loop runs 6 times (EDITED. I mistakently said 5 times before)
    
    io_V1_mat = repmat(io(:, vsPtr), [1,points])';
    
    subplot(3, 2, vsPtr)
    
    cm = colormap(parula(points));
   
    srf = surf(io_V1_mat,RL_mat,  VL(:,:,vsPtr) ); % do I need to insert a 4th argument with the cm that I need?
    
    cb = colorbar;
    
    set(cb, 'ylim', [min(min(VL(:,:, vsPtr))) max(max(VL(:,:,vsPtr)))]);
    
    cb.Label.String = 'Load Resitance Node Voltage';
    cb.Label.FontSize = 12;
    
    view(70, 50)
    
    grid on
    grid minor
    box on
    
    axis tight
    
    srf = gca;
    srf.YScale = 'log';
    srf.XScale = 'log';
    
    srf.XLabel.String = 'Iout [A]';
    srf.YLabel.String = 'RL [Ohms]';
    srf.Title.String = sprintf('Vs = %0.1f V', Vs(vsPtr));
    
end

My question is:

How on earth can I assign the color range from the colobars to the colormap of each plot? (look at the correspondence I am referring to here: I want to assign the color gradient shown in the colorbar to the colormap from each surf plot).

I have tried every proposed solution here in Mathworks without success (pulling my hair here tbh)

Any ideas?

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Answer 1

Kevin Holly 2022-9-2

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1793745-how-to-match-colorbar-with-colormap-ranges-in-surf#answer_1040780

在 MATLAB Online 中打开

io_V1_mat=linspace(1000,100000,10);

RL_mat=linspace(1000,1000000,10);

VL=[2000*rand(10,4) 5000*rand(10,6)];

surf(io_V1_mat,RL_mat, VL, VL )% The fourth input is your values that correspond with the color map

colorbar

caxis([0 2000])% You can also change the limits of your colormap.

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Daniel Melendrez 2022-9-3

在 MATLAB Online 中打开

Dear Kevin

Thank you for your kind help.

Unfortunately, this does not solve my "problem". If you see your example, the maximum value (2000) corresponds to a yellow tone, which does not match the maximum shown in the surf plot.

Similary, even after removing the line:

caxis([0 2000])% You can also change the limits of your colormap.

The maximum limits are not coloured according to the colorbar. For instance, the data tip shown in the following picture shows a Z value of 4587.12 which according to the colour bar should be in the yellow regime however, it is in shades of blue and green [1000, 3000] approx.

In my case, the maximum value for the first dimension of my 10x10(x5) data set presents a peak around 1250 (coloured in aqua) whereas the color bar shows a yellow tone for this value range:

How can I match the surf colormap to the 10 colours shown by the colorbar?

To clarify, I included a fourth argument, as you suggested without success

srf = surf(io_V1_mat, RL_mat, VL(:,:,vsPtr), VL(:,:,vsPtr) );

Any thoughts?

Kevin Holly 2022-9-3

在 MATLAB Online 中打开

Ah, I see what you mean. You can add 'FaceColor','interp' to your surf function. For more info, click here.

io_V1_mat=linspace(1000,100000,10);

RL_mat=linspace(1000,1000000,10);

VL=[2000*rand(10,4) 5000*rand(10,6)];

surf(io_V1_mat,RL_mat, VL, VL,'FaceColor','interp')% Add 'FaceColor','interp'

colorbar

caxis([0 4000])

Daniel Melendrez 2022-9-6

在 MATLAB Online 中打开

Dear Kevin

My apologies for the late reply

You were absolutely right!

Adding:

'FaceColor', 'interp'

did the trick

I think this information is explained in the 'FaceColor' section from the surf help page, however, it wasn't so evident for me. Perhaps more examples of the use of this modifier are needed.

Final result: