Help with unification cycle

Hello! I have been given 2 matrices in one value, zeros in another, and units I need to combine them

x=[0 1 1 0 0 0 0 1 1 0 0 0 0 0 1 1 1 0 0 0 0]
y=[200 900 900 200 200 ...]
    
I need to make it so that wherever the units are replaced by values

[TADA]

could you clarify what is the role of each matrix (x and y) and how you want to address the ones and zeros? posting sample input and desired output would also help, as well as what you have tried already

Answer 1

[Rik]

x(x==1)=y;