// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA, Serge Steer
// Copyright (C) - 2010 - DIGITEO - Michael Baudin
// Copyright (C) DIGITEO - 2011 - Allan CORNET
//
// 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_V2.1-en.txt
function x = cosd(x)
    //Element wise cosine , argument in degree.

    rhs = argn(2);
    if rhs <> 1 then
        error(msprintf(gettext("%s: Wrong number of input argument(s): %d expected.\n"),"cosd", 1));
    end
    
    if type(x) <> 1 | ~isreal(x) then
        error(msprintf(gettext("%s: Wrong type for input argument #%d: Real matrix expected.\n"),"cosd",1));
    end

    n = round(x/90);
    x = x - n*90;
    m = pmodulo(n,4);
    x(m==0) = cos(%pi/180*x(m==0));
    x(m==1) = -sin(%pi/180*x(m==1));
    x(m==2) = -cos(%pi/180*x(m==2));
    x(m==3) = sin(%pi/180*x(m==3));
endfunction