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/usr/share/octave/packages/nurbs-1.3.10/deg2rad.m is in octave-nurbs 1.3.10-1.

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function rad = deg2rad(deg)
  
% DEG2RAD: Convert degrees to radians.
% 
% Calling Sequence:
% 
%   rad = deg2rad(deg);
% 
% INPUT:
% 
%   deg		: Angle in degrees.
%
% OUTPUT:
% 
%   rad		: Angle in radians. 
% 
% Description:
% 
%   Convenient utility function for converting degrees to radians, which are
%   often the required angular units for functions in the NURBS toolbox.
% 
% Examples:
% 
%   // Convert 35 degrees to radians
%   rad = deg2rad(35);
%
%    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/>.

rad = pi*deg/180.0;

end