spline with non monotonic axis

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.

Answer 1

[Matt J]

        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,:));