; data.csv
;
; C1,C2,C3,C4,C5
; 1,5,9,13,17
; 2,6,10,14,18
; 3,7,11,15,19
; 4,8,12,16,20

table: read.csv "data.csv"
data: []
loop table 'row [
    addable: ["SUM"]
    if row <> first table ->
        addable: @[to :string sum map row 'x [to :integer x]]

    'data ++ @[row ++ addable]
]

loop data 'row [
    loop row 'column ->
        prints pad column 6
    print ""
]