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what dos this instruction mean

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billel madridi
billel madridi 2013-5-16
i meet this instruction when analyzing a matlab file could you help me what does it mean ?
yone=(y==i)+(y~=i)*-1;
when y is a column vector and i is fix number i=4;
what will be the size of yone in this case ?

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Walter Roberson
Walter Roberson 2013-5-16
A value of "1" where the entries are "i", and a value of "-1" where the entries are not "i", and 0 where the entries are NaN.

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