Mercurial > hg > ltpda

annotate m-toolbox/classes/@cdata/minus.m @ 3:960fe1aa1c10 database-connection-manager

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Add LTPDADatabaseConnectionManager implementation. Java code
author Daniele Nicolodi <nicolodi@science.unitn.it>
date Mon, 05 Dec 2011 16:20:06 +0100
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Daniele Nicolodi <nicolodi@science.unitn.it>
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1 % MINUS implements subtraction operator for cdata objects.
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2 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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3 %
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4 % DESCRIPTION: MINUS implements subtraction operator for two cdata objects.
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5 %
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6 % CALL: a = d1-d2
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7 % a = minus(d1,d2);
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8 %
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9 % <a href="matlab:utils.helper.displayMethodInfo('cdata', 'minus')">Parameters Description</a>
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10 %
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11 % VERSION: $Id: minus.m,v 1.3 2011/04/08 08:56:34 hewitson Exp $
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12 %
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13 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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14
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15 function varargout = minus(varargin)
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16
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17 % get two data objects
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18 d1 = copy(varargin{1}, nargout);
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19 d2 = copy(varargin{2}, nargout);
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20
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21 % check units
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22 d1.yunits.simplify();
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23 d2.yunits.simplify();
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24
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25 if ~isempty(d1.yunits.strs) && ~isempty(d2.yunits.strs) && d1.yunits ~= d2.yunits
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26 error('### When subtracting two data objects, the yunits must be the same');
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27 end
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28
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29 % add the data
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30 dout = applyoperator(d1,d2,'minus');
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31
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32 % handle units: since both are the same, we take the first non-empty unit
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33 if isempty(d1.yunits.strs)
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34 dout.yunits = d2.yunits;
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35 else
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36 dout.yunits = d1.yunits;
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37 end
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38
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39 % handle errors
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40 err = @(err1, err2) sqrt(err1 .^2 + err2.^2);
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41 if ~isempty(d1.dy) || ~isempty(d2.dy)
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42 if isempty(d1.dy)
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43 d1.dy = zeros(size(d2.dy));
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44 end
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45 if isempty(d2.dy)
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46 d2.dy = zeros(size(d1.dy));
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47 end
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48 dout.dy = err(d1.dy, d2.dy);
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49 else
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50 dout.dy = [];
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51 end
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52
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53
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54 % Single output
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55 varargout{1} = dout;
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56
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57 end
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