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 1.2 2006/08/11 11:48:15 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 | if isa(varargin{i},'sdpvar') |
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22 | varargin{i}= ncvar(struct(varargin{i})); |
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23 | end |
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24 | |
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25 | [n(i),m(i)]=size(varargin{i}); |
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26 | end |
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27 | |
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28 | % Keep only non-empty |
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29 | keep_these = find((n.*m)~=0); |
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30 | if length(keep_these)<length(n) |
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31 | varargin = {varargin{keep_these}}; |
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32 | n = n(keep_these); |
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33 | m = m(keep_these); |
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34 | end; |
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35 | |
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36 | % All heights should be equal |
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37 | if any(n~=n(1)) |
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38 | error('All matrices on a row in the bracketed expression must have the same number of rows.'); |
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39 | end |
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40 | |
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41 | nblocks = size(varargin,2); |
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42 | |
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43 | isasdpvar = zeros(nblocks,1); |
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44 | for i = 1:nblocks |
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45 | isasdpvar(i) = isa(varargin{i},'ncvar'); |
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46 | isachar(i) = isa(varargin{i},'char'); |
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47 | end |
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48 | |
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49 | % Finish if this is a symbolic expression |
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50 | % including '?' operators |
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51 | if any(isachar) |
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52 | y = blkvar; |
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53 | for i = 1:nargin |
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54 | if isachar(i) |
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55 | switch varargin{i} |
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56 | case {'i','I'} |
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57 | y(1,i) = 1; |
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58 | case {'s'} |
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59 | case 'z' |
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60 | y(1,i) = 0; |
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61 | otherwise |
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62 | end |
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63 | else |
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64 | y(1,i) = varargin{i}; |
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65 | end |
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66 | end |
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67 | return |
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68 | end |
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69 | |
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70 | % Find all free variables used |
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71 | all_lmi_variables = []; |
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72 | for i = 1:nblocks |
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73 | if isasdpvar(i) |
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74 | all_lmi_variables = [all_lmi_variables varargin{i}.lmi_variables]; |
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75 | end |
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76 | end |
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77 | all_lmi_variables = uniquestripped(all_lmi_variables); |
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78 | |
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79 | % Pick one of the sdpvar objects to build on... |
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80 | y = varargin{min(find(isasdpvar))}; |
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81 | |
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82 | % Some indexation tricks |
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83 | n = n(1); |
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84 | |
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85 | basis_i = []; |
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86 | basis_j = []; |
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87 | basis_s = []; |
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88 | shft = 0; |
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89 | for j = 1:nblocks |
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90 | if isasdpvar(j) |
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91 | in_this = find(ismembc(all_lmi_variables,varargin{j}.lmi_variables)); |
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92 | dummy = [1 1+in_this]; |
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93 | [i2,j2,s2] = find(varargin{j}.basis); |
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94 | j2 = dummy(j2); |
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95 | add_shift = size(varargin{j}.basis,1); |
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96 | else |
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97 | [i2,j2,s2] = find(varargin{j}(:)); |
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98 | add_shift = size(varargin{j}(:),1); |
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99 | end |
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100 | basis_i = [basis_i;i2(:)+shft]; |
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101 | basis_j = [basis_j;j2(:)]; |
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102 | basis_s = [basis_s;s2(:)]; |
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103 | shft = shft + add_shift; |
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104 | end |
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105 | basis = sparse(basis_i,basis_j,basis_s,sum(m)*n,1+length(all_lmi_variables)); |
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106 | |
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107 | y.dim(1) = n; |
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108 | y.dim(2) = sum(m); |
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109 | y.basis = basis; |
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110 | y.lmi_variables = all_lmi_variables; |
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111 | % Reset info about conic terms |
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112 | y.conicinfo = [0 0]; |
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113 | |
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