you could try the following:
>das$danger <- 0
>das$danger[das$bmi > 30 & das$age > 65] <- 1
On Jan 2, 2008 9:16 AM, Gerard Smits <[EMAIL PROTECTED]> wrote:
>
> Thanks, but I tried the single ampersand, but got a warning msg with
> the same lack of correct assignment:
>
> > if (das$age>65 & das$bmi>30) {das$danger<-1} else das$danger<-0
> Warning message:
> In if (das$age > 65 & das$bmi > 30) { :
> the condition has length > 1 and only the first element will be used
> > attach(das)
>
> The following object(s) are masked from das ( position 3 ) :
>
> age bmi day id male sex status
>
> > das
>
> id age sex bmi status day male danger
> 1 33001 35 M 27.5 0 365 1 0
> 2 33002 29 M 34.9 1 22 1 0
> 3 33003 41 F 23.6 0 365 0 0
> 4 33004 55 F 27.0 0 365 0 0
> 5 42001 37 M 39.0 0 365 1 0
> 6 42002 53 M 26.6 1 124 1 0
> 7 42003 46 F 45.4 1 287 0 0
> 8 42004 35 F 36.2 0 365 0 0
> 9 42005 38 F 24.6 0 365 0 0
> 10 42006 58 F 28.0 0 365 0 0
> 11 42007 27 M 25.0 0 365 1 0
> 12 42008 65 F 24.6 0 365 0 0
> 13 42009 25 F 28.0 0 365 0 0
> 14 43001 66 M 27.8 0 365 1 0
> 15 43002 57 F 34.0 0 365 0 0
> 16 43003 45 F 38.1 0 365 0 0
> 17 43004 33 F 53.3 1 62 0 0
> 18 43005 56 F 36.5 0 365 0 0
> 19 43006 31 F 22.4 1 1 0 0
> 20 43007 53 F 32.2 1 21 0 0
> 21 55001 51 M 29.2 0 365 1 0
> 22 55002 33 F 18.7 0 365 0 0
> 23 55003 40 F 30.3 0 365 0 0
> 24 55004 67 M 31.9 0 365 1 0 <-
> 25 55005 41 F 35.0 0 365 0 0
> 26 55006 44 F 37.3 0 365 0 0
> 27 55007 67 M 28.4 1 1 1 0
> 28 55008 65 F 28.8 0 365 0 0
> 29 55009 76 M 18.8 1 225 1 0
> 30 55010 75 F 21.1 1 39 0 0
> 31 63001 30 F 24.9 0 365 0 0
> 32 63002 36 F 47.2 1 377 0 0
> 33 63003 45 F 32.0 0 365 0 0
> 34 63004 49 F 32.3 0 365 0 0
> 35 63005 41 F 20.2 0 365 0 0
> 36 63006 60 F 28.2 0 365 0 0
> 37 63007 33 F 24.5 0 365 0 0
> 38 63008 36 F 28.4 1 56 0 0
> 39 63009 31 F 22.1 0 365 0 0
> 40 63010 77 M 26.6 1 9 1 0
> 41 63011 41 F 32.0 0 365 0 0
> 42 63012 40 F 38.5 1 92 0 0
> 43 63013 27 M 20.6 0 365 1 0
>
>
>
>
> At 02:11 PM 1/1/2008, Christos Hatzis wrote:
> >You need to use '&' instead of '&&':
> >
> >A shorter version of your code using ifelse:
> >
> >das$danger <- with(das, ifelse(age>65 & bmi>30, 1, 0))
> >
> >HTH
> >
> >-Christos
> >
> > > -----Original Message-----
> > > From: [EMAIL PROTECTED]
> > > [mailto:[EMAIL PROTECTED] On Behalf Of Gerard Smits
> > > Sent: Tuesday, January 01, 2008 5:04 PM
> > > To: r-help@r-project.org
> > > Subject: [R] if statement problem
> > >
> > > Hi All,
> > >
> > > I have a small dataset named das (43 cases) in which I am
> > > trying to create a binary outcome (1/0) based on the following code:
> > >
> > > if (das$age>65 && das$bmi>30) {das$danger<-1} else das$danger<-0
> > >
> > > I am setting a flag called 'danger' to 1 of the subject is
> > > over 65 and has a BMI > 30.
> > >
> > > I find that my statement evaluates the first record in the
> > > data.frame and then carries that assignment for all. I
> > > detected this as I played around with the values and found
> > > that the T/F status of the first record was always carried
> > > dowqn. I have gotten this to work with an elseif
> > > construction, but would like to know what is happening here.
> > >
> > > Thanks,
> > >
> > > Gerard
> > >
> > > Using: Windows Vista and R 2.61
> > >
> > >
> > > Code and output:
> > >
> > > das<- sasxport.get("c:\\personal\\r\\das.xpt")
> > > if (das$age>65 && das$bmi>30) {das$danger<-1} else das$danger<-0
> > > attach(das)
> > > das
> > >
> > >
> > > The following object(s) are masked from das ( position 3 ) :
> > >
> > > age bmi day id male sex status
> > >
> > > id age sex bmi status day male danger
> > > 1 33001 35 M 27.5 0 365 1 0
> > > 2 33002 29 M 34.9 1 22 1 0
> > > 3 33003 41 F 23.6 0 365 0 0
> > > 4 33004 55 F 27.0 0 365 0 0
> > > 5 42001 37 M 39.0 0 365 1 0
> > > 6 42002 53 M 26.6 1 124 1 0
> > > 7 42003 46 F 45.4 1 287 0 0
> > > 8 42004 35 F 36.2 0 365 0 0
> > > 9 42005 38 F 24.6 0 365 0 0
> > > 10 42006 58 F 28.0 0 365 0 0
> > > 11 42007 27 M 25.0 0 365 1 0
> > > 12 42008 65 F 24.6 0 365 0 0
> > > 13 42009 25 F 28.0 0 365 0 0
> > > 14 43001 66 M 27.8 0 365 1 0
> > > 15 43002 57 F 34.0 0 365 0 0
> > > 16 43003 45 F 38.1 0 365 0 0
> > > 17 43004 33 F 53.3 1 62 0 0
> > > 18 43005 56 F 36.5 0 365 0 0
> > > 19 43006 31 F 22.4 1 1 0 0
> > > 20 43007 53 F 32.2 1 21 0 0
> > > 21 55001 51 M 29.2 0 365 1 0
> > > 22 55002 33 F 18.7 0 365 0 0
> > > 23 55003 40 F 30.3 0 365 0 0
> > > 24 55004 67 M 31.9 0 365 1 0 <- Problem case should
> > > =1 for danger
> > > 25 55005 41 F 35.0 0 365 0 0
> > > 26 55006 44 F 37.3 0 365 0 0
> > > 27 55007 67 M 28.4 1 1 1 0
> > > 28 55008 65 F 28.8 0 365 0 0
> > > 29 55009 76 M 18.8 1 225 1 0
> > > 30 55010 75 F 21.1 1 39 0 0
> > > 31 63001 30 F 24.9 0 365 0 0
> > > 32 63002 36 F 47.2 1 377 0 0
> > > 33 63003 45 F 32.0 0 365 0 0
> > > 34 63004 49 F 32.3 0 365 0 0
> > > 35 63005 41 F 20.2 0 365 0 0
> > > 36 63006 60 F 28.2 0 365 0 0
> > > 37 63007 33 F 24.5 0 365 0 0
> > > 38 63008 36 F 28.4 1 56 0 0
> > > 39 63009 31 F 22.1 0 365 0 0
> > > 40 63010 77 M 26.6 1 9 1 0
> > > 41 63011 41 F 32.0 0 365 0 0
> > > 42 63012 40 F 38.5 1 92 0 0
> > > 43 63013 27 M 20.6 0 365 1 0
> > >
> > > [[alternative HTML version deleted]]
> > >
> > > ______________________________________________
> > > R-help@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.
> > >
> > >
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@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.
>
--
Tim Calkins
0406 753 997
______________________________________________
R-help@r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
