multiple colours in a trajectory plot

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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?

Accepted Answer

Star Strider
Star Strider on 10 Apr 2018
Edited: Star Strider on 11 Apr 2018
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.
  6 Comments
Walter Roberson
Walter Roberson on 17 Jan 2021
%flip the current colormap
colormap(flipud(colormap))
or for fixed colormap
colormap(flipud(jet))

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More Answers (1)

Walter Roberson
Walter Roberson on 10 Apr 2018
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.

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