?? evalppf.m
字號:
function [pts, yi] = evalppf(t, xi, A)
n = length(t);
[p, q] = size(A);
if n-1 ~= p
error('Vector t and matrix A must be "compatible"')
end
yi = [];
pts = union(t, xi);
for m=1:p
l = find(pts == t(m));
r = find(pts == t(m+1));
if m < n-1
yi = [yi polyval(A(m,:), pts(l:r-1))];
else
yi = [yi polyval(A(m,:), pts(l:r))];
end
end
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