multiple colours in a trajectory plot

Question

CLARK KENDRICK GO 2018-4-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/393810-multiple-colours-in-a-trajectory-plot

评论： Walter Roberson 2021-1-17

I have a time series X, which I can plot in x-y plane.

plot(X(:,1), X(:,2), 'r.')

This gives a red dot colour. What I want to do is I want to make this graph such that the colour represents the colour of the rainbow. (Red at the start, violet in the end) This is so we can give a time sense of the trajectory.

How do we do this?

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Answer 1

Star Strider 2018-4-10

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https://ww2.mathworks.cn/matlabcentral/answers/393810-multiple-colours-in-a-trajectory-plot#answer_314291

编辑：Star Strider 2018-4-11

在 MATLAB Online 中打开

Try this:

X = [(0:50)' sin((0:50)*pi/10)'];                               % Create ‘X’
cm = colormap(jet);                                             % Approximates Spectrum
X(end,2) = NaN;                                                 % Set Last Value To ‘NaN’ To Create Line
c = flipud(X(:,1));                                                     % Define Colours To Scale With ‘X(:,1)’
figure
patch(X(:,1), X(:,2), c, 'EdgeColor','interp')

EDIT — Added plot image.

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Niklas Kurz 2021-1-17

Would also be worth knowing how to apply the color map upside down, with other words going up the y-axis

Walter Roberson 2021-1-17

在 MATLAB Online 中打开

%flip the current colormap
colormap(flipud(colormap))

or for fixed colormap

colormap(flipud(jet))

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Answer 2

Walter Roberson 2018-4-10

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https://ww2.mathworks.cn/matlabcentral/answers/393810-multiple-colours-in-a-trajectory-plot#answer_314288

It is not possible to have multiple colors on a line create by a single call to plot() or the underlying function line() .

You can look in the File Exchange for a couple of contributions for drawing colored lines. One of them uses surface objects, and one of them uses patch objects.