Find Command after certain Value

Dear Community Members,

I am looking for a function to return the rowindex of the following problem: Assuming a matrix A, I need the index of the first "2" in A that follows a "3". Hence, the required index in the following example is "8". The length of A might differ between different cases.

 A = [1, 1, 2, 2, 3, 3, 4, 2, 2, 5, 6, 2, 2]'

Unfortunately, I do not know how to solve this problem in Matlab.

Answer 1

[Reshma Nerella]

Hi,

The following code will return the required index .

 flag = 0;
 val = find(A == 3,1);        % finding the index of first occurrence of 3
 for i = val+1 : size(A,1)
     if A(i)== 2              % checking if the element is 2
         flag = 1;
         break;
     end
 end
 if flag
     index = i;   % first occurrence of ‘2’ after a ‘3’ occurred
 end

If flag is 0 then the element is not present in the array.