Select column 2 to last column in R

问题

I have a data frame with multiple columns. Now, I want to get rid of the row.names column (column 1), and thus I try to select all the other columns.

E.g.,

newdata <- olddata[,2:10]

is there a default symbol for the last column so I don't have to count all the columns? I tried

newdata <- olddata[,2:]

but it didn't work.

回答1:

I think it's better to focus on wanting to get rid of one column of data and not wanting to select every other column. You can do this as @Arun suggested:

olddata[,-1]

Or:

olddata$ColNameToDelete <- NULL

回答2:

You can get the last column with ncol():

 newdata <- olddata[,2:ncol(olddata)]

来源：https://stackoverflow.com/questions/15326792/select-column-2-to-last-column-in-r