How to vectorize this code with logical idexing

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pietro
pietro 2014-5-14
评论： pietro 2014-5-15
Hi all,
I have the following code, how can I avoid the for to make it faster?
a=[10:5:50];
b=[10:20:50];
c=rand(size(a));
for i=length(b)-1
d=c(a>=b(i) & a<b(i+1));
end
thanks
cheers
  1 个评论
Jos (10584)
Jos (10584) 2014-5-15
Since you're only storing the last values of d in each iteration, you can skip the for-loop completely:
i = length(b)-1
d = c(a>=b(i)) & a<b(i+1))
but I am pretty sure you intend to do something else.
What should happen with the values of d obtained in the iterations 1 to length(b)-2?

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Andrei Bobrov
Andrei Bobrov 2014-5-14
编辑：Andrei Bobrov 2014-5-15
a=[10:5:50];
b=[10:20:50];
c=rand(size(a));
[~,ii] = histc(a,b);
d = accumarray(ii(:),c(:),size(b(:)),@(x){x})
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