How to find common numbers in 4 matrices

Hello i have 4 arrays,2001x1 and actually there is nothing in common for the rows but if i use 'ismember' then for some rows i got result '1' even if not all the numbers are the same for the row.

    b = ismember(ismember(ismember(distancee6,machines(:,1)),kkk3),kkk);

i use this, how can i fix it to have an exact result? Thank you

Answer 1

[Roger Stafford]

Apparently from your statement, "find common numbers in 4 matrices", you should be using matlab's 'intersect' function, not 'ismember'.

   b = intersect(intersect(intersect(distancee6,machines(:,1)),kkk3),kkk);

or

   b = intersect(intersect(distancee6,machines(:,1)),intersect(kkk3,kkk));