MATLAB: Spline with non monotonic axis

non-monotonicspline

Hello I am using the spline function. Here is an example from the spline documentation.
Example: Interpolate a sine-like curve over a finer mesh
 
        x = 0:10;
        y = sin(x);
        xq = 0:.25:10;
        yq = spline(x,y,xq);
        figure
        plot(x,y,'o',xq,yq)
OK in my case I have x that varies non monotonic. For example:
        t = 0:100;
        x= sin(0.2*t);
        y = cos(0.6*t);
        plot(x,y);
How to plot the spline for this case.

Best Answer

        t = 0:100;
        x= sin(0.2*t);
        y = cos(0.6*t);
        
        tq = 0:.25:100;
        xy = spline(t,[x;y],tq);
        plot(xy(1,:),xy(2,:));
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