by uniform subdivision
a dense sequence f(tt) of points on the uniform
B-spline curve f of order k with
B-spline coefficients c. Explicitly, this is the
the B-spline with knots a,...,z,
and n the number of coefficients in c,
i.e., [d,n] equals size(c).
spcrv(c) chooses the order k to
sure that at least maxpnt points are generated.
The default value for the maximum number of sites tt to
be generated is 100.
The parameter interval that the site sequence tt fills
out uniformly is the interval [k/2 .. (n-k/2)].
The output consists of the array f(tt).
The following would show a questionable broken line and its
points = [0 0 1 1 0 -1 -1 0 0 ;
0 0 0 1 2 1 0 -1 -2];
values = spcrv(points,3);
hold on, plot(values(1,:),values(2,:)), hold off
Repeated midpoint knot
insertion is used until there are at least maxpnt sites.
There are situations where use of fnplt would be more efficient.
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