This merely translates the matrix multiplication I used into explicit
arithmetic!
Nor does it generalize without extra manipulation to get the correct
arithmetic expression.
-- Bert
Bert Gunter
Genentech Nonclinical Biostatistics
(650) 467-7374
"Data is not information. Information is not knowledge. And knowledge
is certainly not wisdom."
H. Gilbert Welch
On Fri, Feb 21, 2014 at 9:25 AM, arun <smartpink...@yahoo.com> wrote:
> Hi IOanna,
>
> Do you have rows with multiple '1's? If not, you could also try:
> A$Variable <- c("none",names(A)[-1])[1+with(A,B+2*C+3*D)]
> A.K.
>
>
>
>
> On Friday, February 21, 2014 4:44 AM, ioanna ioannou <ii54...@msn.com> wrote:
> Thank you very much. One further question.
>
> Assuming that for some points there is no classification for example:
>
> A<-data.frame(A=c(10,100,1000,30,50,60,300,3),
>
> B=c(0,1,1,1,0,0,0,0),
>
> C=c(0,0,0,0,1,1,0,0),
>
> D=c(1,0,0,0,0,0,1,0))
>
> Is there an easy way to introduce an extra none option in the variable?
>
> A<-data.frame(A=c(10,100,1000,30,50,60,300,3),
>
> B=c(0,1,1,1,0,0,0,0),
>
> C=c(0,0,0,0,1,1,0,0),
>
> D=c(1,0,0,0,0,0,1,0),
>
> Variable=c(D,B,B,B,C,C,D,none))
>
> Thanks in advance,
> IOanna
>
>
> -----Original Message-----
> From: arun [mailto:smartpink...@yahoo.com]
> Sent: 21 February 2014 00:19
> To: r-help@r-project.org
> Cc: ioanna ioannou
> Subject: Re: [R] Data manipulation in a data.frame
>
> Also,
> rownames(which(t(!!A[,-1]),arr.ind=TRUE))
> A.K.
>
>
>
>
> On Thursday, February 20, 2014 6:48 PM, arun <smartpink...@yahoo.com> wrote:
> Hi,
> May be this helps:
>
> A$Variable <- rep(colnames(A[,-1]),nrow(A))[t(!!A[,-1])]
> A.K.
>
>
>
> On Thursday, February 20, 2014 5:55 PM, ioanna ioannou <ii54...@msn.com>
> wrote:
> Hello,
>
>
>
>
>
> Assuming that I have a data frame
>
> A<-data.frame(A=c(10,100,1000,30,50,60,300),
>
> B=c(0,1,1,1,0,0,0),
>
> C=c(0,0,0,0,1,1,0),
>
> D=c(1,0,0,0,0,0,1))
>
>
>
> What I would like is to introduce a new column Variable such that:
>
>
>
> A<-data.frame(A=c(10,100,1000,30,50,60,300),
>
> B=c(0,1,1,1,0,0,0),
>
> C=c(0,0,0,0,1,1,0),
>
> D=c(1,0,0,0,0,0,1),
>
> Variable=c(D,B,B,B,C,C,D))
>
>
>
> How can I do it?
>
>
>
> Best
>
> IOanna
>
>
> [[alternative HTML version deleted]]
>
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