1 | function F = subsref(F,Y) |
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2 | %subsref Overloaded indexing |
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3 | |
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4 | % Author Johan Löfberg |
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5 | % $Id: subsref.m,v 1.4 2005/02/04 10:10:27 johanl Exp $ |
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6 | |
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7 | switch Y(1).type |
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8 | case '()' |
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9 | thelmi = Y.subs{1}; |
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10 | |
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11 | % Early bail to optmize code for standard case |
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12 | if isa(thelmi,'double') % &(isa(F,'lmi') % |
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13 | |
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14 | else |
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15 | if ~(isa(F,'lmi') & (isa(thelmi,'logical') | isa(thelmi,'double') | isa(thelmi,'char'))) |
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16 | error('First argument should be an lmi object and second argument integer or string') |
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17 | end |
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18 | |
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19 | % If indexed using handle, convert to index |
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20 | if isa(thelmi,'char') |
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21 | thelmitemp = []; |
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22 | for i = 1:size(F.clauses,2) |
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23 | if strcmp(F.clauses{i}.handle,thelmi) |
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24 | thelmitemp=[thelmitemp i]; |
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25 | end |
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26 | end |
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27 | if isempty(thelmitemp) |
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28 | em = ['LMI ''' thelmi ''' not available.']; |
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29 | error(em) |
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30 | else |
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31 | thelmi = thelmitemp; |
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32 | end |
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33 | end |
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34 | |
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35 | if islogical(thelmi) |
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36 | thelmi = double(find(thelmi)); |
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37 | end |
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38 | |
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39 | end |
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40 | |
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41 | % Checks so that it exist |
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42 | if any((thelmi<1)) | any((thelmi>size(F.clauses,2))) |
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43 | em = ['LMI #' num2str(thelmi) ' not available.']; |
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44 | error(em) |
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45 | end |
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46 | |
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47 | % These indicies |
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48 | j = thelmi; |
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49 | ineqs = find(j<=size(F.clauses,2)); |
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50 | ineqs_j = j(ineqs); |
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51 | |
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52 | if isempty(ineqs_j) |
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53 | F.clauses = {}; |
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54 | F.LMIid = []; |
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55 | else |
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56 | F.clauses = F.clauses(ineqs_j); |
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57 | F.LMIid = F.LMIid(ineqs_j); |
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58 | end |
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59 | case '{}' |
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60 | switch length(Y) |
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61 | case 1 |
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62 | if length(Y.subs)>1 |
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63 | error('Only one-dimensional indexing of set objects allowed'); |
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64 | end |
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65 | if Y.subs{1}>length(F.clauses) |
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66 | em = ['LMI #' num2str(Y.subs{1}) ' not available.']; |
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67 | error(em) |
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68 | error('Index exceeds set dimension.') |
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69 | end |
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70 | F = F.clauses{Y.subs{1}}.data; |
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71 | case 2 |
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72 | F = F.clauses{Y(1).subs{1}}.data; |
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73 | F = subsref(F,Y(2)); |
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74 | otherwise |
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75 | error('Indexing type not supported'); |
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76 | end |
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77 | otherwise |
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78 | error('Indexing type not supported'); |
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79 | end |
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80 | |
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81 | |
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82 | |
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