How can I change/replace values in second column according to conditions?

Here is the matrix 10x2

     1    10
     2    24
     3     7
     4     0
     5    18
     6     3
     7    15
     8     2
     9     1
    10     2

I want to if value in second column is equal 1,2,3,4,13,14,15,16 code will write 1;

5,6,7,8,17,18,19,20 code will write 2;

9,10,11,12,21,22,23,24 code will write 3

and if it is 0, it will write 4. Like this that I want

     1    1
     2    3
     3    2
     4    4
     5    2
     6    3
     7    1
     8    2
     9    1
    10    2

Answer 1

[CS Researcher]

Try this:

 T = A(:,2);
 a = [1,2,3,4,13,14,15,16];
 b = [5,6,7,8,17,18,19,20];
 c = [9,10,11,12,21,22,23,24];
 T(ismember(T,a)) = 1;
 T(ismember(T,b)) = 2;
 T(ismember(T,c)) = 3;
 T(T==0) = 4;

 A(:,2) = T;

[Selin Ozdemir]

Thank you