arrayformula sum in Google spreadsheet

Question

How do you arrayformula() a sum() such as:

=sum(A1:H1)

I need to go down 1000 rows.

Answer 1

Summing A-H horizontal and running down for 523 lines:

=ARRAYFORMULA(iferror(mmult(A1:H523;TRANSPOSE(column(A1:H1))^0)))

Answer 2

Let us not complicate this. Simply put parenthesis in each of the array in the range.

=arrayformula( Sum( (A1:A):(H1:H) )

This spans not only upto 1000 rows but upto infiinity.

If you really want to limit then go

=arrayformula( Sum( (A1:A1000):(H1:H1000) )

Answer 3

Using Query

=INDEX(TRANSPOSE(
  QUERY(TRANSPOSE(FILTER(A2:H,A2:A<>"")),
  "select sum(Col"&JOIN("), sum(Col",SEQUENCE(COUNTA(A2:A)))&")",0)
),,2)

notes:

• generating query string on the fly

Answer 4

Another option:

=ArrayFormula(SUMIF(IF(COLUMN(A1:H1),ROW(A1:A1000)),ROW(A1:A1000),A1:H1000))