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Matrix

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Mate 2u
Mate 2u 2012-4-12
I have a matrix S1 and S2 which consist of +1, -1 and 0.
I want a matrix S such that it is +1 if there is +1 in both S1 and S2. -1 if there is -1 in both S1 and S2. 0 if anything else.

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2012-4-12
eg
S1 = randi([-1 1],10)
S2 = randi([-1 1],10)
solution
k= S1 + S2
S = (k==2) - (k==-2)
OR
S = (S1 == 1 & S2 == 1) - (S1 == -1 & S2 == -1)
MORE variant
S = (S1 == S2).*S1
or
S = (S1 == S2).*S2

更多回答（1 个）

Wayne King
Wayne King 2012-4-12
One way
x = [1 -1; 1 -1];
y = [1 1; 1 -1];
Z= zeros(size(x));
Indx1 = find(x==1);
Indy1 = find(y==1);
Indxneg1 = find(x==-1);
Indyneg1 = find(y==-1);
Ind1 = intersect(Indx1,Indy1);
Z(Ind1) = 1;
Indneg1 = intersect(Indxneg1,Indyneg1);
Z(Indneg1) = -1;

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