Finding the elements in two matrices with different sizes?

Hello eveeryone, i have 2 matrices lets say A=[1,2,3,4,5,6,7,8] B = [1,11,12,3,3,5] what i want is to have such a result C=[1,3,3,5] what i want is compare two matrices ok that we can do that with intersect(), but in intersect function i only have [1,3,5], that is not what i want. what i want is even if it is repeated in matrix B compare with A and then have a matrix of C. The A and B sizes changing for each simulation. Can you help me please?

[Cladio Andrea]

and in matrix A there is no possiblity to have repeating elements, all different.

Answer 1

[Roger Stafford]

You can also use 'ismember':

   C = B(ismember(B,A));

Answer 2

[Image Analyst]

Try setdiff():

A=[1,2,3,4,5,6,7,8] 
B = [1,11,12,3,3,5] 
[~, ia]=setdiff(B, A)
C = B; % Initialize to B
C(ia) = [] % Remove different elements.

Answer 3

[Cladio Andrea]

2 amazing answers thank you so much for your help guys!!!!!