Thanks all.
"%in%" is what i need.
2009/11/13 jim holtman <jholt...@gmail.com>
> I think you want to use '%in%' instead of '=='. Try debugging (or
> understanding) what is happening by evaluating the subexpressions of
> the compares you have in your original posting. Also take a look at
> the 'recycling' of arguments and then you may understand what is
> happening:
>
> > data2[(data2$x1 %in% data_1$x1) & (data2$y1 %in% data_1$y1) & (data2$tag
> == 0),]
> areaid x1 y1 tag
> 2 1 1.53 2.34 0
> 4 1 1.52 2.35 0
> >
>
>
> On Thu, Nov 12, 2009 at 10:04 PM, rusers.sh <rusers...@gmail.com> wrote:
> > Hi Rusers,
> > I found sometimes that the same values cannot be judged to be the same
> in
> > R. Anybody knows the probelm? I think i ignored some minor detail.
> Thanks.
> > Here is the example.
> > ############
> >
> data1<-matrix(data=c(1,1.2,1.3,"3/23/2004",1,1.5,2.3,"3/22/2004",2,0.2,3.3,"4/23/2004",3,1.5,1.3,"5/22/2004"),nrow=4,ncol=4,byrow=TRUE)
> > data1<-data.frame(data1);names(data1)<-c("areaid","x","y","date")
> > data2<-matrix(data=c(1,1.22,1.32,1, 1.53, 2.34,1, 1.21, 1.37,1,
> 1.52,
> > 2.35,2, 0.21, 3.33,2, 0.23, 3.35,3, 1.57, 1.31,3, 1.59,
> > 1.33),nrow=8,ncol=3,byrow=TRUE)
> > data2<-data.frame(data2);names(data2)<-c("areaid","x1","y1")
> > data2$tag<-0
> > data1_1<-data1[1,]
> > data2_1<-data2[data2$areaid==data1_1$areaid & data2$tag==0,]
> > ran_1<-sample(c(1:length(data2_1)),2, replace = FALSE)
> > data2_1<-data2_1[ran_1,]
> > data_1<-merge(data1_1,data2_1)
> > #data_1
> > # areaid x y date x1 y1 tag
> > # 1 1 1.2 1.3 3/23/2004 1.52 2.35 0
> > # 2 1 1.2 1.3 3/23/2004 1.53 2.34 0
> > data2[data_1$x1==data2$x1 & data_1$y1==data2$y1 & data2$tag==0,]
> > #data2[c(data_1$x1==data2$x1 & data_1$y1==data2$y1 & data2$tag==0),]
> > # areaid x1 y1 tag
> > #2 1 1.53 2.34 0
> > There should be two same observations between data_1 and data2, but here
> > only one was identified.
> > Thanks a lot.
> >
> > --
> > -----------------
> > Jane Chang
> > Queen's
> >
> > [[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.
> >
>
>
>
> --
> Jim Holtman
> Cincinnati, OH
> +1 513 646 9390
>
> What is the problem that you are trying to solve?
>
--
-----------------
Jane Chang
Queen's
[[alternative HTML version deleted]]
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