How to Subtract two rows of same matrix?

 I have a matrix A=[2 3;5 6] and then I have another matrix A1=[3 4 5;6 7 8;0 0 1].I want to subtract 2nd row from first row of Matrix A and after that I want to insert it into second row of matrix A1 ,then how can I do that?

Answer 1

[Matz Johansson Bergström]

tmp = A(1,:)-A(2,:)
But A1 is a 3x3 matrix and not like A which is a 2x2, so how do you want to insert the elements?

We could do it either

A1(2, 1:2)=tmp
or
A1(2, 2:3)=tmp

In the above expressions you may substitute tmp and write A(1,:)-A(2,:) directly if you wish.