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Diffstat (limited to 'modules/statistics/macros/sample.sci')
-rwxr-xr-x | modules/statistics/macros/sample.sci | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/modules/statistics/macros/sample.sci b/modules/statistics/macros/sample.sci new file mode 100755 index 000000000..76b220630 --- /dev/null +++ b/modules/statistics/macros/sample.sci @@ -0,0 +1,53 @@ +// 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 + |