How can i create this specific matrix??

Hello. I'm MATLAB beginner.

I want to make A matrix like below.

ex1)

i = 2

j = 3

A = [1,1,0,0,0,0 ; 0,0,1,1,0,0 ; 0,0,0,0,1,1]

ex2)

i = 2

j = 2

A = [1,1,0,0 ; 0,0,1,1]

ex3)

i = 3

j = 4

A = [1,1,1,0,0,0,0,0,0,0,0,0 ; 0,0,0,1,1,1,0,0,0,0,0,0 ; 0,0,0,0,0,0,1,1,1,0,0,0 ; 0,0,0,0,0,0,0,0,0,1,1,1]

Could you MATLAB masters please help me??

Answer 1

[Chunru]

i=3;
j=4;
A = kron(eye(j), ones(1,i))

A = 4×12

1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1

[연승 김]

wow. it works well!!

you are genius..!!!

Funcicton 'kron' is good^^