Hi Arnaud,
Try aggregate function
regards
M
arnaud Gaboury a écrit :
I have a data frame called "pose":
DESCRIPTION QUANITY CLOSING.PRICE
1 WHEAT May/10 1 467.75
2 WHEAT May/10 2 467.75
3 WHEAT May/10 1 467.75
4 WHEAT May/10 1 467.75
5 COTTON NO.2 May/10 1 78.13
6 COTTON NO.2 May/10 3 78.13
7 COTTON NO.2 May/10 1 78.13
I would like to sum the quantity for each category (i.e WHEAT and
COTTON),but I have no idea how to write it in a simple manner. The number or
rows will change every day.
TY for any help.
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
--
Mohamed Lajnef,IE
INSERM U955 eq 15
Pôle de Psychiatrie
Hôpital CHENEVIER
40, rue Mesly
94010 CRETEIL Cedex FRANCE
mohamed.laj...@inserm.fr
tel : 01 49 81 31 31 (poste 18470)
Sec : 01 49 81 32 90
fax : 01 49 81 30 99
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
