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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 t=acosm(x)
// Matrix wise Arccosine Cosine-inverse
rhs = argn(2);
if rhs <> 1 then
error(msprintf(gettext("%s: Wrong number of input argument(s): %d expected.\n"),"acosm",1));
end
if type(x)<>1 then
error(msprintf(gettext("%s: Wrong type for input argument #%d: Real or complex matrix expected.\n"),"acosm",1));
end
[m,n]=size(x);
if m<>n then
error(msprintf(gettext("%s: Wrong size for input argument #%d: A square matrix expected.\n"),"acosm",1));
end
t=-%i*logm(x+%i*sqrtm(eye()-x*x));
endfunction
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