Matrix with some sort of pattern

Hi everybody, i would like to make a matrices like this [1,1,1,1,1,0,0,0,0,0;0,0,0,0,0,1,1,1,1,1;] or this [-1 0 0;-1 0 0;-1 0 0;-1 -1 0;-1 -1 0; -1 -1 0;-1 -1 -1;-1 -1 -1;-1 -1 -1] in such a way that 'for' loop would be unnecessary.i was thinking something about repmat or so,because of the pattern that this kind of matrices seem to have.any ideas??? Thank you!!

Answer 1

[Matt J]

You could use KRON

    >> kron(eye(2), ones(1,5))

    >> kron(tril(ones(3)),-ones(3,1))

[Andreas]

Matt J. YOU are amazing. Thanx.

[Mishaal Amir]

How to do this for an 9 by 9 matrix, with the number 9s surrounding the borders and the 0s in the center of the matrix?