/usr/share/octave/packages/nurbs-1.3.10/private/nrb_srf_basisfun__.m is in octave-nurbs 1.3.10-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 35 36 37 38 39 40 41 | function [B, N] = nrb_srf_basisfun__ (points, nrb);
% __NRB_SRF_BASISFUN__: 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 = size (nrb.coefs, 2) -1;
n = size (nrb.coefs, 3) -1;
p = nrb.order(1) -1;
q = nrb.order(2) -1;
u = points(1,:);
v = points(2,:);
npt = length(u);
U = nrb.knots{1};
V = nrb.knots{2};
w = squeeze(nrb.coefs(4,:,:));
spu = findspan (m, p, u, U);
spv = findspan (n, q, v, V);
NuIkuk = basisfun (spu, u, p, U);
NvJkvk = basisfun (spv, v, q, V);
indIkJk = nrbnumbasisfun (points, nrb);
for k=1:npt
wIkaJkb(1:p+1, 1:q+1) = reshape (w(indIkJk(k, :)), p+1, q+1);
NuIkukaNvJkvk(1:p+1, 1:q+1) = (NuIkuk(k, :).' * NvJkvk(k, :));
RIkJk(k, :) = reshape((NuIkukaNvJkvk .* wIkaJkb ./ sum(sum(NuIkukaNvJkvk .* wIkaJkb))),1,[]);
end
B = RIkJk;
N = indIkJk;
end
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