CODEWITHSUNDEEP
matlabsearchfind
Mia
Mia

Reputation: 181

vectorize a search function matlab

looking for an efficient way to vectorize a search

say A is 2 by 4 array

 x      y     z     a
.2      0.97  34.2  4.5

and B is a 1 by 1000 array

a x x x x y y y z z a .........

How do I get the corresponding row 2 values of A for array B. Looking for a vectorized efficient solution, I have an if loop that works but not efficient.

Thanks

I currently have 

A(2,A(1,:)==B(:))

but this doesn't work as both arrays have different sizes. Thanks

Upvotes: 0

Views: 69

Answers (1)

Pursuit
Pursuit

Reputation: 12345

You can use the second output from the ismember function, like this:

%Setup
A = [24 25 26 1; 0.2 0.97 34.2 4.5]
B = [1 24 24 24 24 25 25 25 26 26 1];

%Use ismember to get matching indexes
[~, ixs] = ismember(B, A(1,:))

%Use indexes to get desired result
out = A(2,ixs)

Upvotes: 1

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