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annotate m-toolbox/classes/+utils/@math/randelement.m @ 0:f0afece42f48

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Import.
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 23 Nov 2011 19:22:13 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % RANDELEMENT(VECTOR,J) returns J random samples chosen in the VECTOR array.
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2 %
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3 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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4 %
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5 % DESCRIPTION: RANDELEMENT(VECTOR,N) returns N random samples chosen in the
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6 % VECTOR array. If VECTOR is a scalar,
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7 % than it answers with N samples from
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8 % 1:1:VECTOR.
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9 %
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10 % CALL: out = randelement(arr, j)
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11 %
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12 % INPUTS: arr - numerical vector array or cell vector array; can be
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13 % single line or single column.
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14 % j - number of samples to extract
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15 %
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16 % OUTPUTS: out - numerical vector array or cell vector array, shaped as
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17 % the input 'arr', containing j elements chosen among
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18 % those included in 'arr'.
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19 %
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20 % VERSION: $Id: randelement.m,v 1.5 2009/08/10 00:49:50 nicola Exp $
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21 %
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22 % HISTORY: 06-02-2008 N Tateo
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23 % Creation
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24 %
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25 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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26
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27 function out = randelement(arr, j)
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28
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29 if nargin < 2
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30 error('randelement:tooFewInputs','The randelement function requires two input arguments.');
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31 elseif ~isa(arr,'double') && ~isa(arr,'cell')
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32 error('randelement:wrongInput','The input to the randelement function must be a numerical or cell array.')
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33 elseif ~isvector(arr)
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34 error('randelement:wrongShape','The input to the randelement function must be a vector.')
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35 end
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36
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37 N = length(arr);
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38 if N==1
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39 if iscell(arr), arr = num2cell([1:1:arr{1}]);
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40 else arr = [1:1:arr];
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41 end
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42 N = length(arr);
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43 end
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44 out = arr(randi(N,1,j));
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45
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46 if size(arr,1)==1 % reshape as a row vector
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47 out = reshape(out,1,[]);
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48 else % reshape as a column vector
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49 out = reshape(out,[],1);
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50 end
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51
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52 end
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53 % END
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54