[37] | 1 | function [F,h] = loadsdpafile(varargin) |
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| 2 | %LOADSDPAFILE Loads a problem definition in the SDPA format |
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| 3 | % |
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| 4 | % [F,h] = loadsdpafile('filename') Loads the problem min(h(x)), F(x)>0 from file 'filename' |
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| 5 | % [F,h] = loadsdpafile A "Open" - box will be opened |
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| 6 | |
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| 7 | % Author Johan Löfberg |
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| 8 | % $Id: loadsdpafile.m,v 1.3 2005/06/17 13:02:01 joloef Exp $ |
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| 9 | |
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| 10 | filename = varargin{1}; |
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| 11 | |
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| 12 | % Does the file exist |
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| 13 | if ~exist(filename) |
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| 14 | filename = [filename '.dat-s']; |
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| 15 | if ~exist(filename) |
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| 16 | error(['No such file.']); |
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| 17 | end |
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| 18 | end |
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| 19 | |
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| 20 | % Load using SeDuMi |
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| 21 | try |
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| 22 | [At,b,c,K,perm] = fromsdpa(filename); |
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| 23 | catch |
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| 24 | error('LOADSDPAFILE currently requires SeDuMi to be installed'); |
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| 25 | end |
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| 26 | |
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| 27 | nvars = length(b); |
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| 28 | x = sdpvar(nvars,1); |
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| 29 | |
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| 30 | F = set([]); |
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| 31 | top = 1; |
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| 32 | if isfield(K,'l') |
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| 33 | if K.l(1)>0 |
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| 34 | X = c(top:top+K.l-1)-At(top:top+K.l-1,:)*x; |
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| 35 | F = F + set(X(:)); |
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| 36 | top = top + K.l; |
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| 37 | end |
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| 38 | end |
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| 39 | |
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| 40 | if isfield(K,'s') |
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| 41 | if K.s(1)>0 |
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| 42 | for i = 1:length(K.s) |
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| 43 | [ix,iy,iv] = find([c(top:top+K.s(i)^2-1) At(top:top+K.s(i)^2-1,:)]); |
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| 44 | off = (ix-1)/(K.s(i)+1); |
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| 45 | if all(off == round(off)) |
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| 46 | X = c(top:top+K.s(i)^2-1)-At(top:top+K.s(i)^2-1,:)*x; |
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| 47 | F = F + set(diag(reshape(X,K.s(i),K.s(i))) > 0); |
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| 48 | top = top + K.s(i)^2; |
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| 49 | else |
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| 50 | X = c(top:top+K.s(i)^2-1)-At(top:top+K.s(i)^2-1,:)*x; |
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| 51 | F = F + set(reshape(X,K.s(i),K.s(i)) > 0); |
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| 52 | top = top + K.s(i)^2; |
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| 53 | end |
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| 54 | end |
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| 55 | end |
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| 56 | end |
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| 57 | |
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| 58 | h = -b'*x; |
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| 59 | |
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