which.na

An embedded and charset-unspecified text was scrubbed...
Name: not available
URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20090319/207de96b/attachment-0002.pl>
?is.na
x <- c(NA, 3, 4, 5, NA)
which(is.na(x))
[1] 1 5

Charles Annis, P.E.

Charles.Annis at StatisticalEngineering.com
phone: 561-352-9699
eFax:  614-455-3265
http://www.StatisticalEngineering.com

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

Hi R- users

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

Thanks much in advance!

Regards,
Santosh

______________________________________________
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.
"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]]

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

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