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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) BRUNO PINCON
//
// 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 B=%sp_p_s(A,p)
// handle A^p for scalar integer p only
if length(p) ~= 1 then
error(msprintf(_("%s: Wrong type for input argument #%d: A scalar expected.\n"),"%sp_p_s",2));
end
if floor(p) ~= p then
error(msprintf(_("%s: Wrong type for input argument #%d: An integer expected.\n"),"%sp_p_s",2));
end
if p == 0 then
B = speye(A)
return
elseif p < 0 then
A = inv(A)
p = -p
end
select p
case 1
B = A
case 2
B = A*A
case 3
B = A*(A*A)
case 4
B = A*A
B = B*B
else
B = A
for i=2:p // slow method (we could use the power algorithm)
B = A*B
end
end
endfunction
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