how to combine to matrix with the same rows and different columns

Question

Maryam Hamrahi 2016-12-23

评论： Maryam Hamrahi 2016-12-23

I have matrix A with n rows and three columns, matrix B with n rows and one column. For instance, matrix A and B could be as follows:

As you see, matrix A and B have the same number of rows. I would like to produce matrix C from matrix A, but only rows which are “2” in matrix B.

 C=[3 6
 4 7
 5 2]

It would be appreciated if you could give me some ideas for solving this problem.

Thanks

Answer 1

Walter Roberson 2016-12-23

 A= [1 4
6
7
3
2
9];
 C = A(B == 2, :);

Maryam Hamrahi 2016-12-23

Thank you very much Walter Roberson.

your help is really appreciated.