RosettaCodeData/Task/CSV-data-manipulation/J/csv-data-manipulation-3.j

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require 'tables/csv'
'hdr data'=: split readcsv 'rc_csv.csv' NB. read data, split the header & data
hdr=: hdr , <'SUM' NB. add title for extra column to header
data=: <"0 (,. +/"1) makenum data NB. convert to numeric, sum rows & append column
(hdr,data) writecsv 'rc_out.csv'