/usr/share/octave/packages/nurbs-1.3.10/vecrotx.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 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 | function rx = vecrotx(angle)
%
% VECROTX: Transformation matrix for a rotation around the x axis.
%
% Calling Sequence:
%
% rx = vecrotx(angle);
%
% INPUT:
%
% angle : rotation angle defined in radians
%
% OUTPUT:
%
% rx : (4x4) Transformation matrix.
%
%
% Description:
%
% Return the (4x4) Transformation matrix for a rotation about the x axis
% by the defined angle.
%
% The matrix is:
%
% [ 1 0 0 0]
% [ 0 cos(angle) -sin(angle) 0]
% [ 0 sin(angle) cos(angle) 0]
% [ 0 0 0 1]
%
% Examples:
%
% Rotate the NURBS line (0.0 0.0 0.0) - (3.0 3.0 3.0) by 45 degrees
% around the x-axis
%
% line = nrbline([0.0 0.0 0.0],[3.0 3.0 3.0]);
% trans = vecrotx(%pi/4);
% rline = nrbtform(line, trans);
%
% See also:
%
% nrbtform
%
% Copyright (C) 2000 Mark Spink
%
% This program is free software: you can redistribute it and/or modify
% it under the terms of the GNU General Public License as published by
% the Free Software Foundation, either version 3 of the License, or
% (at your option) any later version.
% This program is distributed in the hope that it will be useful,
% but WITHOUT ANY WARRANTY; without even the implied warranty of
% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
% GNU General Public License for more details.
%
% You should have received a copy of the GNU General Public License
% along with this program. If not, see <http://www.gnu.org/licenses/>.
sn = sin(angle);
cn = cos(angle);
rx = [1 0 0 0; 0 cn -sn 0; 0 sn cn 0; 0 0 0 1];
end
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