[R] which.na

[Martin Maechler]

>>>>> "CAPE" == Charles Annis, P E <Charles.Annis at statisticalengineering.com>
>>>>>     on Thu, 19 Mar 2009 22:46:10 -0400 writes:

    >> ?is.na
    >> x <- c(NA, 3, 4, 5, NA)
    >> which(is.na(x))
    CAPE> [1] 1 5

well, yes, of course, 
but that's not as efficient  for large x  with only few NAs.

But this now has *REALLY*  changed into a topic belonging to
R-devel, not R-help
~~~~~~~     --> hence I've diverted the thread to there.

Martin Maechler, ETH Zurich


    CAPE> Charles Annis, P.E.

    CAPE> Charles.Annis at StatisticalEngineering.com
    CAPE> http://www.StatisticalEngineering.com
 

    CAPE> -----Original Message-----
    CAPE> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
    CAPE> Behalf Of Santosh
    CAPE> Sent: Thursday, March 19, 2009 9:37 PM
    CAPE> To: r-help at r-project.org
    CAPE> Subject: [R] which.na

    CAPE> Hi R- users

    CAPE> I was wondering if there is any function equivalent to which.na used in S+?

    CAPE> Thanks much in advance!

    CAPE> Regards,
    CAPE> Santosh

    CAPE> [[alternative HTML version deleted]]

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    CAPE> ______________________________________________
    CAPE> R-help at r-project.org mailing list
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    CAPE> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
    CAPE> and provide commented, minimal, self-contained, reproducible code.