Re: [R] extract number from a mixture of character and number

Hi, There are lots; the best choice depends on whether your ID values always start with "sub_" or not, and you aren't clear. Here's a general case: testdata <- c("sub_001", "sub_002", "sub_003") gsub("[^0-9]", "", testdata) You can use as.numeric() to convert them if desired. If you use dput()

Re: [R] extract number from a mixture of character and number

Hi, Check ?gsub and the examples there. Here is a piece of code to get you started: > s <- "sub_001" > gsub("sub_", "", s) [1] "001" HTH, Jorge.- On Mon, Jul 16, 2012 at 12:04 PM, york8866 <> wrote: > Hi, all, > > I have a column like the following: > ID TIME

[R] extract number from a mixture of character and number

Hi, all, I have a column like the following: ID TIME sub_001 0 sub_001 24 sub_002 0 sub_00224 sub_003 0 sub_00324 sub_004