[R] function ave() with seq_along returning char sequence instead of numeric
Nordlund, Dan (DSHS/RDA)
NordlDJ at dshs.wa.gov
Tue Nov 1 01:11:47 CET 2016
Thanks for the response. You are right of course. I went back and reread the help page. I guess I just glossed over the 'x is numeric' statement because the default FUN was the mean, and seq_along doesn't care about type. I should know better than to disregard what I read in the help pages. But you are right, using any numeric vector of appropriate size as the first argument does what I need.
Daniel Nordlund, PhD
Research and Data Analysis Division
Services & Enterprise Support Administration
Washington State Department of Social and Health Services
> -----Original Message-----
> From: Jeff Newmiller [mailto:jdnewmil at dcn.davis.ca.us]
> Sent: Monday, October 31, 2016 4:34 PM
> To: Nordlund, Dan (DSHS/RDA); r-help at r-project.org
> Subject: Re: [R] function ave() with seq_along returning char sequence
> instead of numeric
> The help page describes the first argument x as a numeric... it is not
> designed to accept character, so the fact that you get anything even close to
> right is just a bonus.
> As the doctor says, "if it hurts, don't do that".
> ave( rep( 1, length( v ), v, FUN=seq_along )
> Sent from my phone. Please excuse my brevity.
> On October 31, 2016 3:29:01 PM PDT, "Nordlund, Dan (DSHS/RDA)"
> <NordlDJ at dshs.wa.gov> wrote:
> >Given the following R statements
> >v <- c('a', 'a', 'a', 'b', 'b', 'b', 'c', 'c', 'c', 'c') ave(v,
> >list(v), FUN=seq_along)  "1" "2" "3" "1" "2" "3" "1" "2" "3" "4"
> >I was expecting to get a numeric vector back. I apparently have missed
> >something in the documentation. If vector v is character, then the
> >numeric sequence is converted to character before returning. I can
> >work around by doing something like
> >ave(seq_along(v), list(v), FUN=seq_along)  1 2 3 1 2 3 1 2 3 4
> >Is the work around the best way to go, or have I missed an option in
> >the documentation?
> >Daniel Nordlund, PhD
> >Research and Data Analysis Division
> >Services & Enterprise Support Administration Washington State
> >Department of Social and Health Services
> >R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> >PLEASE do read the posting guide
> >and provide commented, minimal, self-contained, reproducible code.
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