Prime 7, programing "if" any of these values.

Greetings, im trying to program something that fills a matrix automatically, but you can choose wich rows and columns to make 0 instead.

So far i can do it by hand, just setting what row and colum i want (fil=row), and adding extra conditions to the "if" 

I tried to use a matrix instead, like row:=[1 2 3], so if i= any of those 3 values, it assign it 0, but it doesnt seem to work with a matrix, i wrote it something like "if i=fil1_i" (_i meaning subscript), but it doesnt compare it to the value on the matrix.

Im working with Power Flow equations, in this part i need to do a 2x2 matrix each space being a Jacobian matrix. Im trying to automate it, because this is with 2 "bars" so matrix are 2x2, but when its something like 6 bars i dont want to do everything by hand