// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) INRIA
// 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 e = nextpow2(n)
    [lhs, rhs] = argn(0);
    if rhs <> 1 then
        error(msprintf(gettext("%s: Wrong number of input argument(s): %d expected.\n"),"nextpow2", 1));
    end

    n = abs(n);
    kf = find(~isnan(n)&n<>%inf);
    e = n;
    f = zeros(n);
    [f(kf), e(kf)] = frexp(n(kf));
    k = find(f==0.5); // n(k) is a power of 2
    e(k) = e(k)-1;
endfunction