Extracting indices using findall()

[jling]

ind1 = indall(1:4) do i
    MzNwq = sum(M[i,j]*z[j] for j in items)+sum(N[i,j]*w[j] for j in items)+q[i]
    l[i] == z[i] && MzNwq > 0
end

however you normally calculate (Mz + Nw + q)_i