How to slice a array and assign values to a matrix?

How to slice a array and assign values to a matrix?

y = [[0,0,0], [0,0,0]]
p = [1,2,3,4,5,6]
y[0] = p[0,2] y[1] = p[3,4]
Returns error I want to assign values in P to y, how to do that?