MATLAB: Multiple colours in a trajectory plot

colourplot

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?

Best Answer

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')