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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} {} lognormal_rnd (@var{a}, @var{v}, @var{r}, @var{c}) |
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22 ## @deftypefnx {Function File} {} lognormal_rnd (@var{a}, @var{v}, @var{sz}) |
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23 ## Return an @var{r} by @var{c} matrix of random samples from the |
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24 ## lognormal distribution with parameters @var{a} and @var{v}. Both |
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25 ## @var{a} and @var{v} must be scalar or of size @var{r} by @var{c}. |
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26 ## Or if @var{sz} is a vector, create a matrix of size @var{sz}. |
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27 ## |
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28 ## If @var{r} and @var{c} are omitted, the size of the result matrix is |
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29 ## the common size of @var{a} and @var{v}. |
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30 ## @end deftypefn |
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31 |
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32 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
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33 ## Description: Random deviates from the log normal distribution |
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34 |
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35 function rnd = lognormal_rnd (varargin) |
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36 |
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37 if (nargin > 1) |
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38 a = varargin{2}; |
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39 idx = a >= 0; |
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40 a(idx) = log (a(idx)); |
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41 a(!idx) = NaN; |
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42 varargin{2} = a; |
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43 endif |
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44 |
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45 if (nargin > 2) |
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46 v = varargin{3}; |
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47 idx = v >= 0; |
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48 v(idx) = sqrt (v(idx)); |
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49 v(!idx) = NaN; |
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50 varargin{3} = v; |
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51 endif |
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52 |
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53 rnd = lognrnd (varargin{:}); |
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54 |
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55 endfunction |
