/usr/share/octave/packages/nurbs-1.3.10/vecangle.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 | function ang = vecangle(num,den)
%
% VECANGLE: An alternative to atan, returning an arctangent in the
% range 0 to 2*pi.
%
% Calling Sequence:
%
% ang = vecmag2(num,dum)
%
% INPUT:
%
% num : Numerator, vector of size (1,nv).
% dem : Denominator, vector of size (1,nv).
%
% OUTPUT:
% ang : Arctangents, row vector of angles.
%
% Description:
%
% The components of the vector ang are the arctangent of the corresponding
% enties of num./dem. This function is an alternative for
% atan, returning an angle in the range 0 to 2*pi.
%
% Examples:
%
% Find the atan(1.2,2.0) and atan(1.5,3.4) using vecangle
%
% ang = vecangle([1.2 1.5], [2.0 3.4]);
%
% 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/>.
ang = atan2(num,den);
index = find(ang < 0.0);
ang(index) = 2*pi+ang(index);
end
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