Custom color of a line based on the value of the 3rd parameter

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SS 2021-9-30

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https://ww2.mathworks.cn/matlabcentral/answers/1463809-custom-color-of-a-line-based-on-the-value-of-the-3rd-parameter

编辑： DGM 2021-9-30

Hi. I am plotting a line using X and Y, I want the line to appear as a continuous line colored based on the value of another 3rd parameter T. T holds the velocity information of the particle at different positions along its trajectory.

For inatance,

X=[1,2,3,4,5,6,7,8,9,10];

Y=[2,4,6,8,10,12,14,16,18,20];

T=[10,10,10,20,30,50,10,30,10,100];

I want a straight line using X and Y, the color of the line should be based on the values of T.

Any help is appreciated.

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Answer 1

DGM 2021-9-30

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https://ww2.mathworks.cn/matlabcentral/answers/1463809-custom-color-of-a-line-based-on-the-value-of-the-3rd-parameter#answer_798414

编辑：DGM 2021-9-30

在 MATLAB Online 中打开

There are a couple ways to do this. Using surf() seems to be the better way in general for lines.

x = [1,2,3,4,5,6,7,8,9,10];

y = [2,4,6,8,10,12,14,16,18,20];

t = [10,10,10,20,30,50,10,30,10,100];

h = surf([x(:) x(:)],[y(:) y(:)],[t(:) t(:)]);

set(h,'facecolor','none','edgecolor','interp');

set(h,'linewidth',3); % make it fat so it's easier to demonstrate

view(2); % only show 2-D view

colormap(jet(256)); % or pick whatever map you want

colorbar

In my opinion, it's always difficult to read these types of plots without making the line rather thick. Discerning small local color differences against a broad white background is difficult. Compare against the same color against inverted colors: