How do I plot a third variable as line color???

Question

Jason Manley 2015-6-17

0
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https://ww2.mathworks.cn/matlabcentral/answers/224265-how-do-i-plot-a-third-variable-as-line-color

评论： Eko 2024-1-30

Hello all--

I'm looking to plot many curves (given by cells X and Y), and I'd like to specify the color of each curve by a third variable (array Z) and display a colorbar for Z.

Currently this is my code:

for i=1:length(X)
    plot(X{i}, Y{i}, 'color', [1 0 Z(i)/max(Z)])
end

This allows me to plot each line as varying shades based on Z, but I have no clue how to make a colorbar.

Any help would be much appreciated!

Thanks, Jason

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Answer 1

Tim 2015-6-17

1
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https://ww2.mathworks.cn/matlabcentral/answers/224265-how-do-i-plot-a-third-variable-as-line-color#answer_183070

在 MATLAB Online 中打开

I think this should work for you:

 Z=1:1:100;
%Colormap is defined as a 3 column matrix, each row being an RGB triplet
map = zeros(numel(Z),3);
map(:,1)=1;
map(:,2)=0;
map(:,3)=Z./max(Z);
%Set the current Colormap
colormap(map);
%Display Colorbar
colorbar