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1 | function y = mldivide(X,Y) |
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2 | %MLDIVIDE (overloaded) |
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3 | |
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4 | % Author Johan Löfberg |
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5 | % $Id: mldivide.m,v 1.4 2006/07/26 20:17:58 joloef Exp $ |
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6 | |
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7 | if (isa(X,'sdpvar')) |
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8 | error('Division of matrix variables not possible.') |
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9 | end |
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10 | |
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11 | try |
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12 | lmi_variables = getvariables(Y); |
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13 | nv = length(lmi_variables); |
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14 | y = Y; |
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15 | n = Y.dim(1); |
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16 | m = Y.dim(2); |
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17 | if m==1 |
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18 | y.basis = X\Y.basis; |
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19 | y.dim(1) = size(y.basis,1); |
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20 | y.dim(2) = 1; |
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21 | else % FIX : VECTORIZE THIS... |
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22 | [L,U] = qr(X); |
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23 | temp = U\(L\reshape(Y.basis(:,1),n,m)); |
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24 | y.basis = temp(:); |
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25 | for i = 1:nv |
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26 | temp = U\(L\reshape(Y.basis(:,i+1),n,m)); |
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27 | y.basis(:,i+1) = temp(:); |
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28 | end; |
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29 | y.dim(1) = size(temp,1); |
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30 | y.dim(2) = size(temp,2); |
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31 | end |
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32 | catch |
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33 | error(lasterr); |
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34 | end |
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