[R] data frame move columns

[arnaud Gaboury]

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$quantity==0,],avprix[avprix$quantity==0,]).

I was just wandering if  there is a more "academic" way to write it?

TY for advice.