Matlab: creating a bigger array using a smaller array -

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i have 2 giant array looks like:

a = [11, 11, 12, 3, 3, 4, 4, 4 ]; b = [ 12, 4; 3, 11; 11, 1; 4, 13 ];

i want create array takes values b , column 1 like:

c = [ 11, 1; 11, 1; 12, 4; 3, 11; 3, 11; 4, 13; 4, 13; 4, 13 ];

i don't want use or other kind of loop optimize process.

sorry being terse.

i search each element column 1 of in column 1 of b , pick corresponding column 2 elements b , create new array column 1 elements of , discovered column 2 elements b.

what doing in problem using a , searching first column of b see if there's match. once there's match, extract out row corresponds matched location in b. repeat rest of values in a.

assuming values of a can found in b , first column of b distinct , there no duplicates, can unique call , sortrows call. unique call on a can assign each value in a unique label in sorted order. use these labels index sorted version of b desired result:

[~,~,id] = unique(a); bs = sortrows(b); c = bs(id,:);

we c:

c =      11     1     11     1     12     4      3    11      3    11      4    13      4    13      4    13

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