Dear R-help, I am trying to rename the variables in a dataframe, called 'T1A' here. Seems renaming was successful, but when I call one of the variable I got error message and I wanted to know why.
The data frame contains 365 rows and 49 columns. I would like to name the first column `DATE` and the others T0.5, T1, T1.5,...,T24 (as this is a set of data collected every half hour for a whole year). Original data is saved as csv file and column 2-49 are named in format '00:30,01:00,01:30,...,23:30,00:00'. When I read them into R by using read.csv, the column names are changed automatically as 'X0.30.00, X1.00.00,...,X23.30.00,X0.00.00' , which dont look great (i mean I would prefer it in a format as 'hh:mm', NOT using 'dot' between numbers that used to indicate time, but I have not found a solution...). So I decided to use a simplified version as above, e.g. T0.5, T1, T1.5,...,T24 and my code is: TIME<-paste(rep("T",48),as.character(seq(0.5,24,by=0.5))) names(T1A)<-c("DATE",TIME) > class(T1A$T0.5) ## without a space between 'T' and '0.5' [1] "NULL" > class(T1A$T 0.5) ## with a space between 'T' and '0.5' Error: unexpected numeric constant in "class(T1A$T 0.5" I also tried the code below, but got same error message... TIME<-paste(rep("T",48),seq(0.5,24,by=0.5)) names(T1A)<-c("DATE",TIME) However, if I do not change the columns' name then everything works fine, e.g. I can call the variables with no problem. class(T1A$X00.30.00) [1] "numeric" Any thoughts?? Many thanks!!! HJ [[alternative HTML version deleted]] ______________________________________________ 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.