Split 2 lines of a matrix?

I have this 4x4 matrix.

I want to get lines 3 and 4 to put them up on the matrix, like:

0 1 1 1 1 1 1 1

1 1 1 1 to 0 1 1 1

1 1 1 1

I've made a 2x4 example to make things easier.

Thanks

Answer 1

[dpb]

B=[A(3:4,:);A];        % create new array keeping old
A=[A(3:4,:);A];        % new array replaces/augments old

More generically,

N=2;                     % number rows at end to add to beginning
A=[A(end-N+1:end,:);A];  % add N last lines at beginning 

[Emanuel]

sorry if i'm asking too much, but could you explain the logic behind

A=[A(end-N+1:end,:);A]; % add N last lines at beginning

?

[dpb]

Just a simple substitution of variables from the explicit case--with the generic ML function end for the last row and the expression for the row number from the end to pick up N rows.

For your specific case that picked up two rows and has size(A,1)==>4, plug in the values and see what you get...