Is it possible to vectorize this loop?

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Senaasa
Senaasa 2014-8-26
回答： Andrei Bobrov 2014-8-26
Hi,
I've been trying to figure out a way to optimize this bit of code by vectorizing the loop. I can't find a good way to do it--maybe it's not possible given the conditional used. In the actual program the array will contain 80,000+ elements so I'm trying to speed things up.
Thanks, Charles
%Test Array
A =[1 2 3 4 5 6;4 5 6 5 6 7;7 8 9 10 11 12;];
B=sum(A,1);
C=mean(B);
E=30*C/100;
F=and(B>=C-E,B<=C+E);
for i=1:2:length(F)-1
if or(F(i)==0,F(i+1)==0)
F(i)=0;
F(i+1)=0;
end
end
G=B(F);

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2014-8-26
A =[1 2 3 4 5 6;4 5 6 5 6 7;7 8 9 10 11 12;];
B=sum(A,1);
C=mean(B);
E=30*C/100;
F=and(B>=C-E,B<=C+E);
F=repmat(all(reshape(F,2,[])),2,1)
F=F(:)'

更多回答（1 个）

Andrei Bobrov
Andrei Bobrov 2014-8-26
F = kron(all(reshape(F,2,[])),[1 1]);

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