Element wise if then in vector

2013 11 26
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更新时间：2013 11 26
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Hi,
I have searched for this but found no answer. I have two arrays M1 and M2 , each with million+ elements.
I want to implement this logic and create a new vector S from each element of M1 and M2
S (i) = 0 if abs(M1(i)-M2(i))< Theta S(i) = sign(M1(i)-M2(i)) otherwise
For loops take forever on this. Any solution that makes it more vector operations would be great.
Vamsi

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回答（1 个）

Vamsi
Vamsi 2013-11-26

0 个投票

I seem to have hit the answer, please do let me know if there is an issue I didn't see. created a T = M1-M2 , initiate S = zeros(length(M1),1).
Then S(ABS(T)>Theta)=sign(T(ABS(T)>Theta))

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Simon
Simon 2013-11-26
That's it!
Andrei Bobrov
Andrei Bobrov 2013-11-26
T = M1 - M2;
S = zeros(numel(M1),1);
l = abs(T) >= Theta;
S(l) = sign(T(l));

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Vamsi
Vamsi
2013-11-26

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Andrei Bobrov
Andrei Bobrov
2013-11-26

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