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annotate m-toolbox/classes/+utils/@math/wfun.m @ 51:9d5c88356247 database-connection-manager

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Make unit tests database connection parameters configurable
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Wed, 07 Dec 2011 17:24:37 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % WFUN defines weighting factor for fitting procedures ctfit, dtfit.
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2 %
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3 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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4 %
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Daniele Nicolodi <nicolodi@science.unitn.it>
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5 % DESCRIPTION
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6 %
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7 % Defines the weigthing factor for the fitting procedure performed by
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8 % ctfit and dtfit.
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9 %
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10 % CALL:
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11 %
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12 % weight = wfun(y,weightparam)
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13 %
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14 % INPUT:
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15 %
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16 % y: are the set of data to be fitted
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17 % weightparam: is a parameter for the swhitching procedure. Admitted
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18 % values are:
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19 % weightparam = 1 --> equal weights (one) for each point. This is the
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20 % default option.
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21 % weightparam = 2 --> weight with the inverse of absolute value of
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22 % data
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23 % weightparam = 3 --> weight with square root of the inverse of
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24 % absolute value of data
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25 % weightparam = 4 --> weight with the inverse of the square mean
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26 % spread
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27 %
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28 %
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29 % OUTPUT:
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30 %
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31 % weight: is the set of weighting factors
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32 %
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33 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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34 % VERSION: $Id: wfun.m,v 1.5 2008/11/17 16:52:23 luigi Exp $
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35 %
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36 % HISTORY: 08-10-2008 L Ferraioli
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37 % Creation
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38 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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39
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40 function weight = wfun(y,weightparam)
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41
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42 [a,b] = size(y);
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43
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44 opt = 0; % default value
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45 if ~isempty(weightparam)
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46 opt = weightparam;
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47 end
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48
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49 switch opt
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50 case 0
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51 disp(' Using external weights... ')
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52 case 1
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53 weight = ones(a,b); % equal weights for each point
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54 case 2
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55 weight = 1./abs(y); % weight with the inverse of absolute value of data
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56 case 3
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57 weight = 1./sqrt(abs(y)); % weight with square of the inverse of absolute value of data
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58 case 4
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59 my = mean(y,max(a,b));
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60 weight = 1./((y-my).^2); % weight with the inverse of the square mean spread
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61 end