/usr/share/octave/packages/nurbs-1.3.7/private/nrb_srf_numbasisfun__.m is in octave-nurbs 1.3.7-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | function idx = nrb_srf_numbasisfun__ (points, nrb)
% __NRB_SRF_NUMBASISFUN__: Undocumented internal function
%
% Copyright (C) 2009 Carlo de Falco
% This software comes with ABSOLUTELY NO WARRANTY; see the file
% COPYING for details. This is free software, and you are welcome
% to distribute it under the conditions laid out in COPYING.
m = nrb.number(1)-1;
n = nrb.number(2)-1;
npt = size(points,2);
u = points(1,:);
v = points(2,:);
U = nrb.knots{1};
V = nrb.knots{2};
p = nrb.order(1)-1;
q = nrb.order(2)-1;
spu = findspan (m, p, u, U);
Ik = numbasisfun (spu, u, p, U);
spv = findspan (n, q, v, V);
Jk = numbasisfun (spv, v, q, V);
for k=1:npt
[Jkb, Ika] = meshgrid(Jk(k, :), Ik(k, :));
idx(k, :) = sub2ind([m+1, n+1], Ika(:)+1, Jkb(:)+1);
end
end
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