MATLAB: How to solve the error “Improper assignment with rectangular empty matrix” caused by an error in the find command

Question

I have the matrix B=[17.9250;17.9750;18.0250;18.0750;18.1250;18.1750] and I have the matrix A=(1800×1).

All values of matrix A are in B.

I want to find the position in A that the values of B are.

For this, I tried to use the find command in two ways:

i) out of the loop

C=find(A==18.1750);

ii) inside a loop, because I have several arrays like A

for k=1:length(A(:,1))
C(k)=find(B==A);
end

However error appears "Improper assignment with rectangular empty matrix", even if this value exists, someone has already passed this problem and can you help me?

I appreciate the attention.

Answer 1

[~,C] = ismember(A,B);