Challenge: Find the largest Sub-Array (7 consecutive elements) within a 1,000 element vector

Patrick2788 

Somewhat longer but with simple steps

= LET(
    init, SUM(TAKE(vector,7)),
    diff, DROP(vector,7) - DROP(vector,-7),
    Addλ, LAMBDA(x,y, x+y),
    sum₇, SCAN(init, diff, Addλ),
    max₇, MAX(sum₇),
    pos₇, 1 + XMATCH(max₇, sum₇),
    HSTACK(pos₇, max₇)
  )