Re: [R] After sorting a dataframe by date

2012-10-25 Thread MacQueen, Don
As David said, you sorted by Date. But sorting by rownames is not really the point. The point is that rownames are not line numbers. The rownames were assigned when the data frame was created, and then preserved when you sorted. Sometimes, rownames contain meaningful information that is associat

Re: [R] After sorting a dataframe by date

2012-10-24 Thread David Winsemius
On Oct 24, 2012, at 2:27 AM, martiny wrote: Ai...I see, i didn't know I can sort rowname. more study to do :) You deleted the context of this thread, but while you are looking at the rownames documentation you might also keep your eyes open for the zoo and xts packages which could convert

Re: [R] After sorting a dataframe by date

2012-10-24 Thread martiny
Ai...I see, i didn't know I can sort rowname. more study to do :) cheers, martin -- View this message in context: http://r.789695.n4.nabble.com/After-sorting-a-dataframe-by-date-tp4647173p4647291.html Sent from the R help mailing list archive at Nabble.com. ___

Re: [R] After sorting a dataframe by date

2012-10-23 Thread David Winsemius
On Oct 23, 2012, at 9:34 AM, martiny wrote: > HI, > I have created a dataframe "df" and try to sort it by its date using the > order() as below: > > df<-read.csv(constr,header=T) > sorted.df<-df[order(as.Date(df$Date), decreasing = F),] > print(sorted.df) > > The dataframe was sorted, but th