view m-toolbox/classes/+utils/@math/wfun.m @ 22:b11e88004fca
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Update collection.fromRepository
author
Daniele Nicolodi <nicolodi@science.unitn.it>
date
Mon, 05 Dec 2011 16:20:06 +0100 (2011-12-05)
parents
f0afece42f48
children
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+ − % WFUN defines weighting factor for fitting procedures ctfit, dtfit.
+ − %
+ − %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ − %
+ − % DESCRIPTION
+ − %
+ − % Defines the weigthing factor for the fitting procedure performed by
+ − % ctfit and dtfit.
+ − %
+ − % CALL:
+ − %
+ − % weight = wfun(y,weightparam)
+ − %
+ − % INPUT:
+ − %
+ − % y: are the set of data to be fitted
+ − % weightparam: is a parameter for the swhitching procedure. Admitted
+ − % values are:
+ − % weightparam = 1 --> equal weights (one) for each point. This is the
+ − % default option.
+ − % weightparam = 2 --> weight with the inverse of absolute value of
+ − % data
+ − % weightparam = 3 --> weight with square root of the inverse of
+ − % absolute value of data
+ − % weightparam = 4 --> weight with the inverse of the square mean
+ − % spread
+ − %
+ − %
+ − % OUTPUT:
+ − %
+ − % weight: is the set of weighting factors
+ − %
+ − %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ − % VERSION: $Id: wfun.m,v 1.5 2008/11/17 16:52:23 luigi Exp $
+ − %
+ − % HISTORY: 08-10-2008 L Ferraioli
+ − % Creation
+ − %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+ −
+ − function weight = wfun(y,weightparam)
+ −
+ − [a,b] = size(y);
+ −
+ − opt = 0; % default value
+ − if ~isempty(weightparam)
+ − opt = weightparam;
+ − end
+ −
+ − switch opt
+ − case 0
+ − disp(' Using external weights... ')
+ − case 1
+ − weight = ones(a,b); % equal weights for each point
+ − case 2
+ − weight = 1./abs(y); % weight with the inverse of absolute value of data
+ − case 3
+ − weight = 1./sqrt(abs(y)); % weight with square of the inverse of absolute value of data
+ − case 4
+ − my = mean(y,max(a,b));
+ − weight = 1./((y-my).^2); % weight with the inverse of the square mean spread
+ − end