On Apr 28, 2010, at 11:14 AM, arnaud Gaboury wrote:
Dear group,
Here is my df:
avprix <-
structure(list(DESCRIPTION = c("CORN Jul/10", "CORN May/10",
"ROBUSTA COFFEE (10) Jul/10", "SOYBEANS Jul/10", "SPCL HIGH GRADE
ZINC USD",
"STANDARD LEAD USD"), prix = c(-1.5, -1082, 11084, 1983.5, -2464,
-118), quantity = c(0, -3, 8, 2, -1, 0), fees = c(-8.64, -30.24,
-26.4, -25.92, -37.5, -25)), .Names = c("DESCRIPTION", "prix",
"quantity", "fees"), row.names = c(NA, -6L), class = "data.frame")
I want to group together all the rows with quantity=0.
This following line does the job :
avprix<-rbind(,avprix[avprix$quantity==0,]).
I was just wandering if there is a more "academic" way to write it?
? order
avprix[order(avprix$quantity),]
Or if you want them at the end ... since TRUE > FALSE:
avprix[order(avprix$quantity==0),]
TY for advice.
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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
