Rev | Line | |
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[37] | 1 | function Z = minus(cx,P) |
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| 2 | %display Overloaded |
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| 3 | |
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| 4 | % Author Johan Löfberg |
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| 5 | % $Id: minus.m,v 1.2 2004/09/19 21:33:49 johanl Exp $ |
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| 6 | |
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| 7 | % Standard case c't-logdet(P) |
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| 8 | |
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| 9 | if isa(P,'logdet') % sdpvr - logdet |
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| 10 | |
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| 11 | if prod(size(cx))>1 |
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| 12 | error('Only scalar terms can be added to a logdet term'); |
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| 13 | end |
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| 14 | |
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| 15 | if isa(cx,'logdet') |
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| 16 | error('Logdet objects can only be added'); |
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| 17 | end |
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| 18 | |
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| 19 | Z = P; |
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| 20 | if isempty(P.cx) |
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| 21 | Z.cx = cx; |
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| 22 | else |
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| 23 | Z.cx = cx-P.cx; |
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| 24 | end |
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| 25 | Z.gain = -Z.gain; |
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| 26 | else % logdet - cx |
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| 27 | temp = cx; |
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| 28 | cx = P; |
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| 29 | P = temp; |
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| 30 | |
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| 31 | Z = P; |
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| 32 | if isempty(P.cx) |
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| 33 | Z.cx = -cx; |
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| 34 | else |
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| 35 | Z.cx = P.cx-cx; |
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| 36 | end |
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| 37 | end |
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