[37] | 1 | function y = horzcat(varargin) |
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| 2 | %HORZCAT (overloaded) |
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| 3 | |
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| 4 | % Author Johan Löfberg |
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| 5 | % $Id: horzcat.m,v 1.7 2006/07/26 20:17:58 joloef Exp $ |
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| 6 | |
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| 7 | prenargin = nargin; |
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| 8 | % Fast exit |
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| 9 | if prenargin<2 |
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| 10 | y=varargin{1}; |
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| 11 | return |
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| 12 | end |
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| 13 | |
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| 14 | % Get dimensions |
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| 15 | n = zeros(prenargin,1); |
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| 16 | m = zeros(prenargin,1); |
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| 17 | for i = 1:prenargin |
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| 18 | if isa(varargin{i},'blkvar') |
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| 19 | varargin{i} = sdpvar(varargin{i}); |
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| 20 | end |
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| 21 | [n(i),m(i)]=size(varargin{i}); |
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| 22 | end |
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| 23 | |
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| 24 | % Keep only non-empty |
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| 25 | keep_these = find((n.*m)~=0); |
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| 26 | if length(keep_these)<length(n) |
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| 27 | varargin = {varargin{keep_these}}; |
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| 28 | n = n(keep_these); |
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| 29 | m = m(keep_these); |
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| 30 | end; |
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| 31 | |
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| 32 | % All heights should be equal |
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| 33 | if any(n~=n(1)) |
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| 34 | error('All matrices on a row in the bracketed expression must have the same number of rows.'); |
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| 35 | end |
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| 36 | |
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| 37 | nblocks = size(varargin,2); |
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| 38 | |
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| 39 | isasdpvar = zeros(nblocks,1); |
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| 40 | for i = 1:nblocks |
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| 41 | isasdpvar(i) = isa(varargin{i},'sdpvar'); |
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| 42 | isachar(i) = isa(varargin{i},'char'); |
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| 43 | end |
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| 44 | |
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| 45 | % Finish if this is a symbolic expression |
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| 46 | % including '?' operators |
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| 47 | if any(isachar) |
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| 48 | y = blkvar; |
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| 49 | for i = 1:nargin |
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| 50 | if isachar(i) |
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| 51 | switch varargin{i} |
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| 52 | case {'i','I'} |
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| 53 | y(1,i) = 1; |
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| 54 | case {'s'} |
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| 55 | case 'z' |
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| 56 | y(1,i) = 0; |
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| 57 | otherwise |
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| 58 | end |
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| 59 | else |
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| 60 | y(1,i) = varargin{i}; |
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| 61 | end |
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| 62 | end |
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| 63 | return |
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| 64 | end |
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| 65 | |
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| 66 | % Find all free variables used |
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| 67 | all_lmi_variables = []; |
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| 68 | for i = 1:nblocks |
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| 69 | if isasdpvar(i) |
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| 70 | all_lmi_variables = [all_lmi_variables varargin{i}.lmi_variables]; |
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| 71 | end |
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| 72 | end |
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| 73 | all_lmi_variables = uniquestripped(all_lmi_variables); |
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| 74 | |
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| 75 | % Pick one of the sdpvar objects to build on... |
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| 76 | y = varargin{min(find(isasdpvar))}; |
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| 77 | |
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| 78 | % Some indexation tricks |
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| 79 | n = n(1); |
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| 80 | |
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| 81 | basis_i = []; |
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| 82 | basis_j = []; |
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| 83 | basis_s = []; |
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| 84 | shft = 0; |
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| 85 | for j = 1:nblocks |
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| 86 | if isasdpvar(j) |
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| 87 | in_this = find(ismembc(all_lmi_variables,varargin{j}.lmi_variables)); |
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| 88 | dummy = [1 1+in_this]; |
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| 89 | [i2,j2,s2] = find(varargin{j}.basis); |
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| 90 | j2 = dummy(j2); |
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| 91 | add_shift = size(varargin{j}.basis,1); |
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| 92 | else |
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| 93 | [i2,j2,s2] = find(varargin{j}(:)); |
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| 94 | add_shift = size(varargin{j}(:),1); |
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| 95 | end |
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| 96 | basis_i = [basis_i;i2(:)+shft]; |
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| 97 | basis_j = [basis_j;j2(:)]; |
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| 98 | basis_s = [basis_s;s2(:)]; |
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| 99 | shft = shft + add_shift; |
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| 100 | end |
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| 101 | basis = sparse(basis_i,basis_j,basis_s,sum(m)*n,1+length(all_lmi_variables)); |
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| 102 | |
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| 103 | y.dim(1) = n; |
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| 104 | y.dim(2) = sum(m); |
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| 105 | y.basis = basis; |
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| 106 | y.lmi_variables = all_lmi_variables; |
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| 107 | % Reset info about conic terms |
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| 108 | y.conicinfo = [0 0]; |
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| 109 | |
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