Rev | Line | |
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[37] | 1 | function X=diag(X,k) |
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| 2 | %DIAG (overloaded) |
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| 3 | |
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| 4 | % Author Johan Löfberg |
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| 5 | % $Id: diag.m,v 1.6 2006/07/26 20:17:57 joloef Exp $ |
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| 6 | |
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| 7 | n = X.dim(1); |
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| 8 | m = X.dim(2); |
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| 9 | |
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| 10 | if nargin == 1 |
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| 11 | k = 0; |
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| 12 | end |
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| 13 | |
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| 14 | if min([n m])==1 |
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| 15 | Y = X; |
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| 16 | diagX = diag(X.basis(:,1),k); |
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| 17 | Y.basis = diagX(:); |
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| 18 | for i = 1:length(X.lmi_variables) |
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| 19 | diagX = diag(X.basis(:,i+1),k); |
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| 20 | Y.basis(:,i+1) = diagX(:); |
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| 21 | end |
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| 22 | Y.lmi_variables = X.lmi_variables; |
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| 23 | Y.dim(1) = size(diagX,1); |
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| 24 | Y.dim(2) = size(diagX,2); |
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| 25 | X=Y; |
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| 26 | else |
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| 27 | index = diag(reshape(1:n*m,n,m),k); |
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| 28 | X.basis = X.basis(index,:); |
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| 29 | X.dim(1) = length(index); |
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| 30 | X.dim(2) = 1; |
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| 31 | X = clean(X); |
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| 32 | end |
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| 33 | % Reset info about conic terms |
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| 34 | if isa(X,'sdpvar') |
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| 35 | X.conicinfo = [0 0]; |
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| 36 | end |
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