On Apr 30, 2010, at 9:08 AM, arnaud Gaboury wrote:
Dear group,
I am losing my mind with a simple question. Sorry if obvious, but I
maybe
start to be confused after days and days of reading documentations.
Df :
df <-
structure(list(a = 1:3, b = 4:6, c = structure(c(1L, 1L, 1L), class =
"factor", .Label = "w")), .Names = c("a",
"b", "c"), row.names = c(NA, -3L), class = "data.frame")
I want to multiply first and second by -1.
x$a<-x$a*-1
x$b<-x$b*-1
This returns what I want, but there must be an one line command to
do it,
right?
> df[ , -3] <- df[ , -3]*-1
> df
a b c
1 -1 -4 w
2 -2 -5 w
3 -3 -6 w
--
David Winsemius, MD
West Hartford, CT
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