Improper assignment with rectangular empty matrix ERROR!

I ran this small code to get the indices for the matching values of b in matrix A. The output throws an error.

a = [1 2 3 4];

b = [2 3 4 5];

 for i = 1:length(b)

   c(i) = find(a == b(i));
end

% ---------------- OUTPUT --------------- %

Improper assignment with rectangular empty matrix.

Error in IndicesOfcomputedValues (line 5)

     c(i) = find(a == b(i));

Answer 1

[madhan ravi]

[idx,values] = ismember(b,a) %returns values and logical index of b in a 

index=find(ismember(b,a)) returns linear index of b in a