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annotate scripts/statistics/distributions/stdnormal_cdf.m @ 3191:e4f4b2d26ee9

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[project @ 1998-10-23 05:43:59 by jwe]
author jwe
date Fri, 23 Oct 1998 05:44:01 +0000
parents
children f8dde1807dee
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1 ## Copyright (C) 1995, 1996, 1997 Kurt Hornik
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2 ##
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3 ## This program is free software; you can redistribute it and/or modify
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4 ## it under the terms of the GNU General Public License as published by
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5 ## the Free Software Foundation; either version 2, or (at your option)
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6 ## any later version.
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7 ##
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8 ## This program is distributed in the hope that it will be useful, but
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9 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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10 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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11 ## General Public License for more details.
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12 ##
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13 ## You should have received a copy of the GNU General Public License
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14 ## along with this file. If not, write to the Free Software Foundation,
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15 ## 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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16
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17 ## usage: stdnormal_cdf (x)
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18 ##
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19 ## For each component of x, compute the CDF of the standard normal
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20 ## distribution at x.
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21
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22 ## Author: KH <Kurt.Hornik@ci.tuwien.ac.at>
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23 ## Description: CDF of the standard normal distribution
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24
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25 function cdf = stdnormal_cdf (x)
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26
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27 if (nargin != 1)
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28 usage ("stdnormal_cdf (x)");
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29 endif
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30
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31 [r_x, c_x] = size (x);
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32 if (r_x * c_x == 0)
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33 error ("stdnormal_cdf: x must not be empty.");
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34 endif
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35
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36 cdf = ( ones (r_x, c_x) + erf (x / sqrt(2)) ) / 2;
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37
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38 endfunction
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