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annotate scripts/statistics/distributions/stdnormal_cdf.m @ 7016:93c65f2a5668

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[project @ 2007-10-12 06:40:56 by jwe]
author jwe
date Fri, 12 Oct 2007 06:41:26 +0000
parents 34f96dd5441b
children a1dbe9d80eee
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1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} stdnormal_cdf (@var{x})
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21 ## For each component of @var{x}, compute the CDF of the standard normal
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22 ## distribution at @var{x}.
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23 ## @end deftypefn
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25 ## Author: KH <Kurt.Hornik@wu-wien.ac.at>
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26 ## Description: CDF of the standard normal distribution
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28 function cdf = stdnormal_cdf (x)
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29
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30 if (nargin != 1)
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31 print_usage ();
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32 endif
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34 sz = size (x);
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35 if (numel(x) == 0)
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36 error ("stdnormal_cdf: x must not be empty");
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37 endif
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39 cdf = (ones (sz) + erf (x / sqrt (2))) / 2;
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40
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41 endfunction
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