I want to calculate Relative Strength Index that use the sum of 14 day of Gains. I can use SUM function then drag down to the bottom, but I want it to expand infinitely (H16 to H). Is there any way to use ARRAYFORMULA? or I must use appscript? I try many things and can't figure the way out.
try:
=ARRAYFORMULA(IF(SEQUENCE(COUNTA(G3:G))<14,,
MMULT(IFERROR(VLOOKUP(ROW(G3:G)-SEQUENCE(1, 14, 0),
{ROW(G3:G), G3:G}, 2, )*1, 0), SEQUENCE(14, 1, 1, 0))))