[R] retrieve rows from frame assuming criterion [corrected]

[Liaw, Andy]

Still wrong:

> x <- data.frame(a = sample(letters[1:3], 10, replace=T), b=1:10)
> x
   a  b
1  a  1
2  a  2
3  b  3
4  b  4
5  a  5
6  a  6
7  b  7
8  b  8
9  b  9
10 c 10
> subset(x, a == c("b", "c"))
   a  b
3  b  3
7  b  7
9  b  9
10 c 10
> subset(x, a %in% c("b", "c"))
   a  b
3  b  3
4  b  4
7  b  7
8  b  8
9  b  9
10 c 10

What matters is the use of "%in%" instead of "==", not the use of subset().

Andy 

> From: Guazzetti Stefano
> 
> sorry for my previus (WRONG)
> answer, as someone already pointed out
> a solution could be
> 
> subset(data, PUNTAR==c("IX49","IX48"))
> 
> 
> 
> > -----Messaggio originale-----
> > Da: Guazzetti Stefano 
> > Inviato: venerdì 23 luglio 2004 15.55
> > A: 'Luis Rideau Cruz'; r-help at stat.math.ethz.ch
> > Oggetto: R: [R] retrieve rows from frame assuming criterion
> > 
> > 
> > Assuming your data.frame is called "data"
> > 
> > data[data$PUNTAR==c("IX49","IX48"),]
> > 
> > is probably what you want
> > 
> > Stefano
> > 
> > 
> > 
> > > -----Messaggio originale-----
> > > Da: Luis Rideau Cruz [mailto:Luisr at frs.fo]
> > > Inviato: venerdì 23 luglio 2004 15.37
> > > A: r-help at stat.math.ethz.ch
> > > Oggetto: [R] retrieve rows from frame assuming criterion
> > > 
> > > 
> > > Hi all,
> > > 
> > > I have a data frame in which one column(PUNTAR) is of 
> > character type.
> > > What I want is to retrieve is the frame but only with those 
> > > rows matching elements of PUNTAR with a list characters (e.g 
> > > c("IX49","IX48") )
> > > 
> > > Year    TUR  STODNR   PUNTAR
> > > 1994  9412 94020061     IX49
> > > 1994  9412 94020062     IX48
> > > 1994  9412 94020063      X32
> > > 1994  9412 94020065      X23
> > > 1994  9412 94020066      X27
> > > 1994  9412 94020067     XI19
> > > 1994  9412 94020068     XI16
> > > 1994  9412 94020069     XI14
> > > 1994  9412 94020070      XI8
> > > 1994  9412 94020071      X25
> > > 1994  9412 94020072      X18
> > > 1994  9412 94020073     II23
> > > 1994  9412 94020074    XII33
> > > 1994  9412 94020075    XII31
> > > 
> > > "my.function"("frame") should be then equal to 
> > > 
> > > Year TURNR   STODNR M_PUNTAR
> > > 1994  9412 94020061     IX49
> > > 1994  9412 94020062     IX48
> > > 
> > > Thank you in advance
> > > 
> > > 
> > > Luis Ridao Cruz
> > > Fiskirannsóknarstovan
> > > Nóatún 1
> > > P.O. Box 3051
> > > FR-110 Tórshavn
> > > Faroe Islands
> > > Phone:             +298 353900
> > > Phone(direct): +298 353912
> > > Mobile:             +298 580800
> > > Fax:                 +298 353901
> > > E-mail:              luisr at frs.fo
> > > Web:                www.frs.fo
> > > 
> > > ______________________________________________
> > > R-help at stat.math.ethz.ch mailing list
> > > https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> > > PLEASE do read the posting guide! 
> > http://www.R-project.org/posting-guide.html
> >
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
> 
>