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// Scilab ( http://www.scilab.org/ ) - This file is part of Scilab
// Copyright (C) 2003 - INRIA - Carlos Klimann
//
// 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 s = sample(n, X, orient)
//
//This function gives a vector (or matrix) nx1. It contains
//a random sample of n extractions, with replacement, from
//the matrix X.
//
//s = sample(n, X) (or s = sample(n, X, '*')) returns a vector s
//whose values are a random sample of n values from X,
//extracted with replacement, from X .
//
//s = sample(n, X, 'r') (or, equivalently, s = sample(n, X, 1))
//returns a matrix of type size(X, 'r')xn. It contains a
//random sample of n rows, extracted with replacement, from
//the rows of X.
//
//s = sample(n, X, 'c') (or, equivalently, s = sample(n, X, 2))
//returns a matrix of type nxsize(X, 'c'). It contains a
//random sample of n columns, extracted with replacement
//from the columns of X.
//
[lhs, rhs] = argn(0)
if rhs < 2 | rhs > 3 then error(msprintf(gettext("%s: Wrong number of input arguments: %d to %d expected.\n"), "sample", 2, 3)), end
if X == [] then s = []; return; end
if rhs == 2 then
orient = "*"
end
if orient == "*" then
s = X(grand(n, 1, "uin", 1, size(X, "*"))),
s_size = size(s, '*');
s = matrix(s, 1, s_size)
return
end
if orient == "r"|orient == 1 then
s = X(grand(1, n, "uin", 1, size(X, "r")), :)
return
end
if orient == "c"|orient == 2 then
s = X(:, grand(n, 1, "uin", 1, size(X, "c"))),
return
end
error(msprintf(gettext("%s: Wrong value for input argument #%d: ''%s'', ''%s'', ''%s'', %d or %d expected.\n"), "sample", 3, "*", "r", "c", 1, 2))
endfunction
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