[R] sorting question

Hi, I have a data frame with variables a, b, c (character vars) and t (time var, could be represented as POSIXct or character, depending on which is most useful. The format is -mm-dd hh:mm:ss CET). Now, I want to sort the data frame in ascending order by a, b, c and then in descending

Re: [R] sorting question

? ~~ To: R Mailing List r-help@r-project.org Sent: Tue, January 11, 2011 12:11:01 PM Subject: [R] sorting question Hi, I have a data frame with variables a, b, c (character vars) and t (time var, could be represented as POSIXct or character, depending on which is most useful

[R] sorting question

I've asked about custom sorting before and it appears that -- in terms of a user-defined order -- it can only be done either by defining a custom class or using various tricks with order Just wondering if anyone has a clever way to order vintages of the form 2002, 2003H1, 2003H2, 2004, 2005Q1,

Re: [R] sorting question

-Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Steve Jaffe Sent: Wednesday, July 01, 2009 9:59 AM To: r-help@r-project.org Subject: [R] sorting question I've asked about custom sorting before and it appears

Re: [R] sorting question

This maps each string to one of the form yearQqtr at which point you can sort them. Modify the mapping as necessary. library(gsubfn) dd - c(2002, 2003H1, 2003H2, 2004, 2005Q1, 2005Q2) gsubfn(H.|Q.|$, list(H1 = Q1, H2 = Q2, Q2 = Q2, Q3 = Q3, Q4 = Q4, Q1), dd) [1] 2002Q1 2003Q1 2003Q2