compare 2 vectors and classify them

I have an array of 90872x2 double. As follows:

A= B=

1 2

1 2

1 2

1 1

1 1

1 1

1 1

2 1

2 1

2 1

2 1

1 2

1 2

1 2

1 2

1 1

1 1

1 1

2 2

2 2

I want to create a column C with the following values accordinf to the following conditions:

1= when A==1 and B==1;

2= when A==1 and B==2;

3= when A==2 and B==1;

4= when A==2 and B==2;

Therefore I will have:

A= B= C=

1 2 2

1 2 2

1 2 2

1 1 1

1 1 1

1 1 1

1 1 1

2 1 3

2 1 3

2 1 3

2 1 3

1 2 2

1 2 2

1 2 2

1 2 2

1 1 1

1 1 1

1 1 1

2 2 4

2 2 4

any help?

[madhan ravi]

1= when A==1 and B==1;----
2= when A==1 and B==2;   |---- are the same???
3= when A==1 and B==1;----
4= when A==2 and B==1;

[Francisco Anaya]

Im sorry you are right, the conditions are:

1= when A==1 and B==1;

2= when A==1 and B==2;

3= when A==2 and B==1;

4= when A==2 and B==2;

Therefore I need:

A= B= C=

1 2 2

1 2 2

1 2 2

1 1 1

1 1 1

1 1 1

1 1 1

2 1 3

2 1 3

2 1 3

2 1 3

1 2 2

1 2 2

1 2 2

1 2 2

1 1 1

1 1 1

1 1 1

2 2 4

2 2 4

I CORRECTED the ortiginal questions. Can you please help me?

[madhan ravi]

Sure see my answer below.

Answer 1

[madhan ravi]

C = 1 * (A==1 & B==1) + 2 * (A==1 & B==2) +...
    3 * (A==2 & B==1) + 4 * (A==2 & B==2) 

Answer 2

[KSSV]

C = A ;

C(A ==1 & B == 1) = 1 ; 
C(A ==1 & B == 2) = 2 ; 
C(A ==2 & B == 1) = 3 ; 
C(A ==2 & B == 2) = 4 ;