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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA, Serge Steer
//
// This file must be used under the terms of the CeCILL.
// This source file is licensed as described in the file COPYING, which
// you should have received as part of this distribution. The terms
// are also available at
// http://www.cecill.info/licences/Licence_CeCILL_V2-en.txt
function x = secd(x)
// Secant argument in degree
if ~isreal(x) then
error(msprintf(gettext("%s: Wrong type for input argument #%d: Array of reals expected.\n"),"secd",1));
end
n = round(x/90);
x = x - n*90;
m = pmodulo(n,4);
x(m==0) = 1 ./ cos(%pi/180*x(m==0));
x(m==1&x<>0) = -1 ./ sin(%pi/180*x(m==1&x<>0));
x(m==1&x==0) = -%inf;
x(m==2) = -1 ./ cos(%pi/180*x(m==2));
x(m==3&x<>0) = 1 ./ sin(%pi/180*x(m==3&x<>0));
x(m==3&x==0) = %inf;
endfunction
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