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1 | function F = ne(X,Y) |
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2 | %NE (overloaded) |
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3 | % |
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4 | % F = set(ne(x,y)) |
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5 | % |
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6 | % See also SDPVAR/AND, SDPVAR/OR, BINVAR, BINARY |
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7 | |
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8 | % Author Johan Löfberg |
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9 | % $Id: ne.m,v 1.3 2005/12/13 12:34:03 joloef Exp $ |
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10 | |
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11 | % Models NE using logic constraints |
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12 | |
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13 | % bin1 = isa(X,'sdpvar') | isa(X,'double'); |
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14 | % bin2 = isa(Y,'sdpvar') | isa(Y,'double'); |
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15 | % |
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16 | % if ~(bin1 & bin2) |
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17 | % error('Not equal can only be applied to integer data') |
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18 | % end |
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19 | |
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20 | if is(X,'binary') & isa(Y,'double') & all((Y == round(Y))) |
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21 | zv = find((Y == 0)); |
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22 | ov = find((Y == 1)); |
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23 | lhs = 0; |
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24 | if ~isempty(zv) |
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25 | lhs = lhs + sum(extsubsref(X,zv)); |
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26 | end |
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27 | if ~isempty(ov) |
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28 | lhs = lhs + sum(1-extsubsref(X,ov)); |
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29 | end |
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30 | F = set(lhs >=1); |
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31 | else |
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32 | F = set((X<=Y-0.5) | (X>=Y+0.5)); |
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33 | end |
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