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1 | function Y=sdpvarfun(varargin) |
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2 | %SDPVARFUN Applies operator on matrix variable |
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3 | % |
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4 | % Y = sdpvarfun('op',X) Applies the Matlab operator 'op' on X |
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5 | % |
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6 | % Example : Y = sdpvarfun('triu',X) Extracts upper triangluar part |
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7 | |
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8 | % Author Johan Löfberg |
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9 | % $Id: sdpvarfun.m,v 1.1 2006/08/10 18:00:22 joloef Exp $ |
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10 | |
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11 | op = varargin{1}; |
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12 | if ~isa(op,'char') |
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13 | error('First argument must be a string with the function name') |
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14 | end |
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15 | |
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16 | X = varargin{2}; |
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17 | Y = X; |
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18 | |
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19 | x_lmi_variables = X.lmi_variables; |
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20 | lmi_variables = []; |
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21 | |
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22 | Y.basis = []; |
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23 | opX = feval(op,reshape(X.basis(:,1),X.dim(1),X.dim(2))); |
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24 | Y.basis = opX(:); |
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25 | |
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26 | j = 1; |
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27 | for i = 1:length(x_lmi_variables) |
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28 | opX = feval(op,reshape(X.basis(:,i+1),X.dim(1),X.dim(2))); |
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29 | if (norm(opX,inf)>0) |
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30 | Y.basis(:,j+1) = opX(:); |
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31 | lmi_variables = [lmi_variables x_lmi_variables(i)]; |
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32 | j = j+1; |
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33 | end |
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34 | end |
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35 | Y.dim(1) = size(opX,1); |
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36 | Y.dim(2) = size(opX,2); |
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37 | Y.lmi_variables = lmi_variables; |
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38 | % Reset info about conic terms |
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39 | Y.conicinfo = [0 0]; |
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