Array formula to sum dynamic range

Question

i have data that looks like this .

I want to insert an array formula, which will sum specific range based on user's choice. If the user chose for example "3", i want an array formula to Sum absolute value of 3 last columns (D,E,F) for each row (rows are also dynamic - there could be 10,50 or more rows). Last column is always in the same place, the starting point change. How can i do that?

Answer 1

Assuming your data starts in cell A1 and the number of columns chosen is in H6 and you are using dynamic array excel then try this formula:

=SUM(ABS(INDEX(A1#,SEQUENCE(ROWS(A1#),1),SEQUENCE(1,COLUMNS(A1#)-H6+1,H6))))

To enter into cell Z9 using vba if nCols contains the number of columns try this:

Range("Z9").formula2="=SUM(ABS(INDEX(A1#,SEQUENCE(ROWS(A1#),1),SEQUENCE(1,COLUMNS(A1#)-" & nCols & "+1," & nCols & "))))"