Is there a faster or alternative way to use find()?

I have two arrays.

size(A,2) = 525

size(B,2) = 4324438.

I'm trying to find the IDX of B that == A(i). I also have to round and take the first IDX just because of the time resolution of the data.

To achieve this I'm currently doing:

IDX =zeros(1,size(A,2));
for i = 1:size(A,2)
idxCueTemp = find(round(B(:),3)==round(A(i),3));
IDX(i) = idxCueTemp(1);
end

This is painfully slow and is taking ~60s to complete.

Is there a better way?

[Matt J]

size(A,2) = 525

size(B,2) = 4324438.

Are size(A,1) and size(B,1) irrelevant for some reason?

Answer 1

[Matt J]

Br=round(B(:),3);
Ar=round(A);

[~,IDX]=ismember(Ar,Br);

[Dc215905]

Amazing, thanks!