Dear R Users, I want to exclude elements in a vector by: vector[-exclude] is it intended to cause an error if no elements are excluded?> vector <- 1:10 > exclude <- NULL > vector[-exclude]Error in -exclude or am I just definig exclude wrong, if no elements should be excluded? with kind regards, Stefan Fritsch
On 9/25/2008 7:43 AM, Stefan Fritsch wrote:> Dear R Users, > > I want to exclude elements in a vector by: > > vector[-exclude] > > is it intended to cause an error if no elements are excluded? > >> vector <- 1:10 >> exclude <- NULL >> vector[-exclude] > Error in -exclude > > or am I just definig exclude wrong, if no elements should be excluded?One approach would be to set "exclude" to a number greater than the length of the vector: x <- 1:10 exclude <- length(x) + 1 x[-exclude] [1] 1 2 3 4 5 6 7 8 9 10 library(fortunes) fortune("dog") Firstly, don't call your matrix 'matrix'. Would you call your dog 'dog'? Anyway, it might clash with the function 'matrix'. -- Barry Rowlingson R-help (October 2004)> with kind regards, > > Stefan Fritsch > > ______________________________________________ > R-help at 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.-- Chuck Cleland, Ph.D. NDRI, Inc. (www.ndri.org) 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894
Try this: vector[ setdiff(seq_along(vector), as.numeric(idx)) ] where idx is your vector of indices to exclude, e.g. idx <- 3:4 idx <- numeric(0) idx <- NULL The last one gets converted to numeric(0) by as.numeric so it still works. On Thu, Sep 25, 2008 at 7:43 AM, Stefan Fritsch <fritsch at bips.uni-bremen.de> wrote:> Dear R Users, > > I want to exclude elements in a vector by: > > vector[-exclude] > > is it intended to cause an error if no elements are excluded? > >> vector <- 1:10 >> exclude <- NULL >> vector[-exclude] > Error in -exclude > > or am I just definig exclude wrong, if no elements should be excluded? > > with kind regards, > > Stefan Fritsch > > ______________________________________________ > R-help at 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. >