On 7/7/2008 3:19 PM, stephen sefick wrote:
This is what I would like to do and it works just fine. Is there a way to
shorten this code so I don't have to subset a subset of a subset?
d<-subset(subset(subset(subset(x, River.Mile<=202), River.Mile>3),
Lagrangian=="Yes"), EventType=="Regular")
You can combine logical tests using &:
d <- subset(x, (River.Mile<=202) & (River.Mile>3) & (Lagrangian=="Yes")
& (EventType=="Regular"))
(The parentheses around the tests are not necessary, but they mean you
don't need to check the operator precedence table, and your test would
work in some other language with different rules.)
Duncan Murdoch
______________________________________________
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.
