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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) 2013 - Samuel Gougeon <sgougeon@free.fr>
//
// 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 rep = %grand_perm(N, V)
// Returns N random permutations of V's components.
// V may be a scalar, a row or column vector, a matrix, or an hypermatrix.
// All data types are supported: Integers, reals, complexes, strings, polynomes..
// if V is a row, permutations are returned as N rows
// if V is a column, permutations are returned as N columns
// if V is a matrix or a true hypermatrix, permutations are returned
// through an additional dimension of size N.
// Author : Samuel Gougeon - 2010
// Version: 1.2
// Software: Scilab and related
//
// Tests:
// with a row of reals:
// m = grand(1, 6, "uin", 0, 10)
// grand_perm(3, m)
// // with a column of reals:
// grand_perm(4, m')
// // with a matrix of reals:
// M = grand(2, 5, "uin", 0, 10)
// grand_perm(3, M)
// // with strings:
// grand_perm(5, ["a" "b" "c" "d"])
// // with polynomes:
// p = (m'-%z)^2
// grand_perm(3, p)
s = size(V);
L = prod(s);
if L == 1 then
rep = V(ones(1, N));
else
//[tmp, k] = gsort(rand(L, N), "r", "i");
k = grand(N, "prm", (1:L).'); // Faster for large L
if length(s) < 3 then
if s(1) == 1 then
rep = matrix(V(k), [s(2) N]).';
elseif s(2) == 1 then
rep = matrix(V(k),[s(1) N]);
else
rep = matrix(V(k), [s N]);
end
else
rep = matrix(V(k), [s N]); end
end
endfunction
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