# [R] integrating 2 lists and a data frame in R

Bogdan Tanasa tanasa at gmail.com
Tue Jun 6 16:41:44 CEST 2017

```Thank you David for the code, as I am learning about xtabs operation. That
works great too ;)

On Tue, Jun 6, 2017 at 7:34 AM, David L Carlson <dcarlson at tamu.edu> wrote:

> Here's another approach:
>
> N <- data.frame(N=c("n1","n2","n3","n4"))
> M <- data.frame(M=c("m1","m2","m3","m4","m5"))
> C <- data.frame(n=c("n1","n2","n3"), m=c("m1","m1","m3"),
> I=c(100,300,400))
>
> # Rebuild the factors using M and N
> C\$m <- factor(as.character(C\$m), levels=levels(M\$M))
> C\$n <- factor(as.character(C\$n), levels=levels(N\$N))
> MN <- xtabs(I~m+n, C)
> print(MN, zero.print="-")
> #     n
> # m     n1  n2  n3 n4
> #   m1 100 300   -  -
> #   m2   -   -   -  -
> #   m3   -   - 400  -
> #   m4   -   -   -  -
> #   m5   -   -   -  -
>
> class(MN)
> # [1] "xtabs" "table"
> # MN is a table. If you want a data.frame
> MN <- as.data.frame.matrix(MN)
> class(MN)
> # [1] "data.frame"
>
> -------------------------------------
> David L Carlson
> Department of Anthropology
> Texas A&M University
> College Station, TX 77840-4352
>
> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Jim Lemon
> Sent: Tuesday, June 6, 2017 6:02 AM
> To: Bogdan Tanasa <tanasa at gmail.com>; r-help mailing list <
> r-help at r-project.org>
> Subject: Re: [R] integrating 2 lists and a data frame in R
>
> Hi Bogdan,
> Kinda messy, but:
>
> N <- data.frame(N=c("n1","n2","n3","n4"))
> M <- data.frame(M=c("m1","m2","m3","m4","m5"))
> C <- data.frame(n=c("n1","n2","n3"), m=c("m1","m1","m3"),
> I=c(100,300,400))
> MN<-as.data.frame(matrix(NA,nrow=length(N[,1]),ncol=length(M[,1])))
> names(MN)<-M[,1]
> rownames(MN)<-N[,1]
> C[,1]<-as.character(C[,1])
> C[,2]<-as.character(C[,2])
> for(row in 1:dim(C)[1]) MN[C[row,1],C[row,2]]<-C[row,3]
>
> Jim
>
> On Tue, Jun 6, 2017 at 3:51 PM, Bogdan Tanasa <tanasa at gmail.com> wrote:
> > Dear Bert,
> >
> > thank you for your response. here it is the piece of R code : given 3
> data
> > frames below ---
> >
> > N <- data.frame(N=c("n1","n2","n3","n4"))
> >
> > M <- data.frame(M=c("m1","m2","m3","m4","m5"))
> >
> > C <- data.frame(n=c("n1","n2","n3"), m=c("m1","m1","m3"),
> I=c(100,300,400))
> >
> > how shall I integrate N, and M, and C in such a way that at the end we
> have
> > a data frame with :
> >
> >
> >    - list N as the columns names
> >    - list M as the rows names
> >    - the values in the cells of N * M, corresponding to the numerical
> >    values in the data frame C.
> >
> > more precisely, the result shall be :
> >
> >      n1  n2  n3 n4
> > m1  100  200   -   -
> > m2   -   -   -   -
> > m3   -   -   300   -
> > m4   -   -   -   -
> > m5   -   -   -   -
> >
> > thank you !
> >
> >
> > On Mon, Jun 5, 2017 at 6:57 PM, Bert Gunter <bgunter.4567 at gmail.com>
> wrote:
> >
> >> Reproducible example, please. -- In particular, what exactly does C look
> >> ilike?
> >>
> >> (You should know this by now).
> >>
> >> -- Bert
> >> Bert Gunter
> >>
> >> "The trouble with having an open mind is that people keep coming along
> >> and sticking things into it."
> >> -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )
> >>
> >>
> >> On Mon, Jun 5, 2017 at 6:45 PM, Bogdan Tanasa <tanasa at gmail.com> wrote:
> >> >  Dear all,
> >> >
> >> > please could you advise on the R code I could use in order to do the
> >> > following operation :
> >> >
> >> > a. -- I have 2 lists of "genome coordinates" : a list is composed by
> >> > numbers that represent genome coordinates;
> >> >
> >> > let's say list N :
> >> >
> >> > n1
> >> >
> >> > n2
> >> >
> >> > n3
> >> >
> >> > n4
> >> >
> >> > and a list M:
> >> >
> >> > m1
> >> >
> >> > m2
> >> >
> >> > m3
> >> >
> >> > m4
> >> >
> >> > m5
> >> >
> >> > 2 -- and a data frame C, where for some pairs of coordinates (n,m)
> from
> >> the
> >> > lists above, we have a numerical intensity;
> >> >
> >> > for example :
> >> >
> >> > n1; m1; 100
> >> >
> >> > n1; m2; 300
> >> >
> >> > The question would be : what is the most efficient R code I could use
> in
> >> > order to integrate the list N, the list M, and the data frame C, in
> order
> >> > to obtain a DATA FRAME,
> >> >
> >> > -- list N as the columns names
> >> > -- list M as the rows names
> >> > -- the values in the cells of N * M, corresponding to the numerical
> >> values
> >> > in the data frame C.
> >> >
> >> > A little example would be :
> >> >
> >> >       n1  n2  n3 n4
> >> >
> >> >       m1  100  -   -   -
> >> >
> >> >       m2  300  -   -   -
> >> >
> >> >       m3   -   -   -   -
> >> >
> >> >       m4   -   -   -   -
> >> >
> >> >       m5   -   -   -   -
> >> > I wrote a script in perl, although i would like to do this in R
> >> > Many thanks ;)
> >> > -- bogdan
> >> >
> >> >         [[alternative HTML version deleted]]
> >> >
> >> > ______________________________________________
> >> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> >> > https://stat.ethz.ch/mailman/listinfo/r-help
> >> posting-guide.html
> >> > and provide commented, minimal, self-contained, reproducible code.
> >>
> >
> >         [[alternative HTML version deleted]]
> >
> > ______________________________________________
> > R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> > https://stat.ethz.ch/mailman/listinfo/r-help
> posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
>
> ______________________________________________
> R-help at r-project.org mailing list -- To UNSUBSCRIBE and more, see
> https://stat.ethz.ch/mailman/listinfo/r-help
> posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>

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