Spline coordinates from spap2
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I am trying to get third order spline approximation for a given set of points.
p=[..;..];
spline=spap2(knots,3,p(1,:),p(2,:));
This works and I can use fnplt to plot the curve. Howver, I am not sure how I can get the orthogonal coordinates.
For cscvn, fnval would return a 2D matrix of coordinates. However, it does not work here. Is there any solution to this?
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Accepted Answer
Torsten
on 29 Jun 2022
Edited: Torsten
on 29 Jun 2022
x = -2:.2:2;
y=-1:.25:1;
[xx, yy] = ndgrid(x,y);
z = exp(-(xx.^2+yy.^2));
sp = spap2({augknt([-2:2],3),2},[3 4],{x,y},z);
xyq = [1.8;0];
value = fnval(sp,xyq)
exp(-xyq.'*xyq)
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