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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA
//
// 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=atanm(a)
// atanm - computes the matrix arctangent
//%CALLING SEQUENCE
// x=atanm(a)
//%PARAMETERS
// a : square matrix
// x : square matrix
rhs = argn(2);
if rhs <> 1 then
error(msprintf(gettext("%s: Wrong number of input argument(s): %d expected.\n"),"atanm",1));
end
if type(a)<>1 then
error(msprintf(gettext("%s: Wrong type for input argument #%d: Real or complex matrix expected.\n"),"atanm",1));
end
if a==[] then x=[],return,end
[m,n]=size(a);
if m<>n then
error(msprintf(gettext("%s: Wrong size for input argument #%d: A square matrix expected.\n"),"atanm",1));
end
//diagonalization
[x,t,bs]=bdiag(a+0*%i*ones(a),1/%eps);
if find(bs>1)<>[] then
error(msprintf(gettext("%s: Matrix is not diagonalisable.\n"),"atanm"));
end
x=t*diag(atan(diag(x)))/t;
if and(imag(a)==0) then x=real(x),end
endfunction
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