[R] data frame move columns

[arnaud Gaboury]

I want the 0s to be at the end or beginning.




> -----Original Message-----
> From: Erik Iverson [mailto:eriki at ccbr.umn.edu]
> Sent: Wednesday, April 28, 2010 5:21 PM
> To: arnaud Gaboury
> Cc: r-help at r-project.org
> Subject: Re: [R] data frame move columns
> 
> 
> > 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,]).
> >
> >
> 
> If you don't care that the 0s are at the end, but rather just grouped,
> just use 'order'.
> 
> avprix[order(avprix$quantity),]