Dear group, I know this issue has been already covered, and before you reply I must say I have read the R-FAQ and search the mailing list archive. I still can't manage to change my factor to numeric as I couldn't find any clear answer.
Here is my df : Pose1 <- structure(list(DESCRIPTION = structure(c(1L, 2L, 3L, 4L, 5L, 8L), .Label = c(" SUGAR NO.11 May/10 ", "COTTON NO.2 May/10 ", "PLATINUM Jul/10 ", "ROBUSTA COFFEE (10) May/10 ", "WHEAT May/10 ", "PRIMARY NICKEL USD", "PRM HGH GD ALUMINIUM USD", "SPCL HIGH GRADE ZINC USD", "STANDARD LEAD USD"), class = "factor"), POSITION = c(5, 3, -1, 15, 4, 2), SETTLEMENT = structure(c(3L, 5L, 2L, 1L, 4L, 8L), .Label = c("1,353.0000", "1,739.4000", "16.5400", "467.7500", "78.1300", "25,760.8600", "2,415.9000", "2,421.0500", "2,357.1200"), class = "factor")), .Names = c("DESCRIPTION", "POSITION", "SETTLEMENT"), row.names = c("1", "2", "3", "4", "5", "51"), class = "data.frame") >S<-Pose1$SETTLEMENT #select the last column > S [1] 16.5400 78.1300 1,739.4000 1,353.0000 467.7500 2,421.0500 Levels: 1,353.0000 1,739.4000 16.5400 467.7500 78.1300 25,760.8600 2,415.9000 2,421.0500 2,357.1200 > str(S) Factor w/ 9 levels "1,353.0000","1,739.4000",..: 3 5 2 1 4 8 Now I need to change S to numeric class > S1<-as.numeric(levels(S))[as.integer(S)] #doesn't work, numbers are rounded or NA Warning message: NAs introduced by coercion > S1<-as.numeric(levels(S))[S] #doesn't work, numbers are rounded or NA Warning message: NAs introduced by coercion > S1<-as.numeric(as.character(S)) #doesn't work, numbers are rounded or NA Warning message: NAs introduced by coercion If it can help, my column S is part of a DF that has been obtained via this line : >pose=read.csv2("LSCPos1.csv",sep=",",dec=".",as.is=T,h=T,skip=1)[,c(4,8,14, 15)] pose <- structure(list(DESCRIPTION = c("WHEAT May/10 ", "WHEAT May/10 ", "WHEAT May/10 ", "WHEAT May/10 ", "COTTON NO.2 May/10 ", "COTTON NO.2 May/10 ", "COTTON NO.2 May/10 ", "PLATINUM Jul/10 ", " SUGAR NO.11 May/10 ", " SUGAR NO.11 May/10 ", " SUGAR NO.11 May/10 ", " SUGAR NO.11 May/10 ", " SUGAR NO.11 May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "ROBUSTA COFFEE (10) May/10 ", "PRM HGH GD ALUMINIUM USD 09/07/10 ", "PRM HGH GD ALUMINIUM USD 09/07/10 ", "PRIMARY NICKEL USD 04/06/10 ", "PRIMARY NICKEL USD 04/06/10 ", "PRIMARY NICKEL USD 10/06/10 ", "PRIMARY NICKEL USD 10/06/10 ", "STANDARD LEAD USD 01/07/10 ", "STANDARD LEAD USD 01/07/10 ", "STANDARD LEAD USD 01/07/10 ", "STANDARD LEAD USD 01/07/10 ", "STANDARD LEAD USD 01/07/10 ", "STANDARD LEAD USD 01/07/10 ", "STANDARD LEAD USD 01/07/10 ", "STANDARD LEAD USD 06/07/10 ", "SPCL HIGH GRADE ZINC USD 08/07/10 ", "SPCL HIGH GRADE ZINC USD 08/07/10 ", "SPCL HIGH GRADE ZINC USD 08/07/10 ", "SPCL HIGH GRADE ZINC USD 09/07/10 ", "SPCL HIGH GRADE ZINC USD 09/07/10 ", "SPCL HIGH GRADE ZINC USD 09/07/10 ", "SPCL HIGH GRADE ZINC USD 09/07/10 ", "SPCL HIGH GRADE ZINC USD 09/07/10 ", "SPCL HIGH GRADE ZINC USD 13/04/10 ", "SPCL HIGH GRADE ZINC USD 13/04/10 " ), CREATED.DATE = structure(c(14705, 14707, 14707, 14711, 14700, 14700, 14711, 14711, 14708, 14708, 14708, 14711, 14711, 14707, 14707, 14707, 14707, 14707, 14708, 14708, 14708, 14708, 14708, 14708, 14708, 14708, 14708, 14672, 14673, 14678, 14678, 14700, 14700, 14700, 14700, 14700, 14700, 14700, 14705, 14707, 14707, 14707, 14708, 14708, 14708, 14708, 14708, 14622, 14634), class = "Date"), QUANITY = c(1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, -1), CLOSING.PRICE = c("467.7500", "467.7500", "467.7500", "467.7500", "78.1300", "78.1300", "78.1300", "1,739.4000", "16.5400", "16.5400", "16.5400", "16.5400", "16.5400", "1,353.0000", "1,353.0000", "1,353.0000", "1,353.0000", "1,353.0000", "1,353.0000", "1,353.0000", "1,353.0000", "1,353.0000", "1,353.0000", "1,353.0000", "1,353.0000", "2,415.9000", "2,415.9000", "25,755.7100", "25,755.7100", "25,760.8600", "25,760.8600", "2,355.9600", "2,355.9600", "2,355.9600", "2,355.9600", "2,355.9600", "2,355.9600", "2,355.9600", "2,357.1200", "2,420.7300", "2,420.7300", "2,420.7300", "2,421.0500", "2,421.0500", "2,421.0500", "2,421.0500", "2,421.0500", "2,388.4300", "2,388.4300" )), .Names = c("DESCRIPTION", "CREATED.DATE", "QUANITY", "SETTLEMENT"), row.names = c(NA, -49L), class = "data.frame") > str(pose) 'data.frame': 49 obs. of 4 variables: $ DESCRIPTION : chr "WHEAT May/10 " "WHEAT May/10 " "WHEAT May/10 " "WHEAT May/10 " ... $ CREATED.DATE:Class 'Date' num [1:49] 14705 14707 14707 14711 14700 ... $ QUANITY : num 1 1 1 1 1 1 1 -1 1 1 ... $ SETTLEMENT : chr "467.7500" "467.7500" "467.7500" "467.7500" ... "Pose$SETTLEMENT" has a "character" class, when it should have been "numeric". So maybe a solution would be to give a numeric class when I read my .csv file? I tried to change class of this column right after the read.csv()(using type.convert() let me with a factor), but again got some rounded number or NA. So, what am I supposed to do?? TY for the help. ______________________________________________ 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.