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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 2, or (at your option) |
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8 ## 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, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {} stdnormal_pdf (@var{x}) |
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22 ## For each element of @var{x}, compute the probability density function |
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23 ## (PDF) of the standard normal distribution at @var{x}. |
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24 ## @end deftypefn |
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25 |
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26 ## Author: TT <Teresa.Twaroch@ci.tuwien.ac.at> |
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27 ## Description: PDF of the standard normal distribution |
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28 |
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29 function pdf = stdnormal_pdf (x) |
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30 |
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31 if (nargin != 1) |
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32 print_usage (); |
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33 endif |
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34 |
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35 sz = size(x); |
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36 pdf = zeros (sz); |
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37 |
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38 k = find (isnan (x)); |
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39 if (any (k)) |
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40 pdf(k) = NaN; |
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41 endif |
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42 |
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43 k = find (!isinf (x)); |
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44 if (any (k)) |
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45 pdf (k) = (2 * pi)^(- 1/2) * exp (- x(k) .^ 2 / 2); |
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46 endif |
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47 |
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48 endfunction |
