Hi all;
I have two vectors A=c(5,2,2,3,3,2)
and B=c(2,3,4,5,6,1,3,2,4,3,1,5,1,4,6,1,4)
and I want to make the following matrix
using the information I have from the above
vectors.
0 1 1 1 1 1
1 0 1 0 0 0
0 1 0 1 0 0
1 0 1 0 1 0
1 0 0 1 0 1
1 0 0 1 0 0
so the first vector says that I have 6
elements therefor I have to make a
6 by 6 matrix and then I have to read
5 elements from the second
vector , and put 1 in [1,j] where j=2,3,4,5,6
and put zero elsewhere( i.e. in [1,1])
and so on.
Any idea how this can be done in R ?
cheers
Mehdi
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Mehdi Ghafariyan <mehdi_ghafariyan at yahoo.com> writes:> Hi all; > I have two vectors A=c(5,2,2,3,3,2) > and B=c(2,3,4,5,6,1,3,2,4,3,1,5,1,4,6,1,4) > and I want to make the following matrix > using the information I have from the above > vectors. > > 0 1 1 1 1 1 > 1 0 1 0 0 0 > 0 1 0 1 0 0 > 1 0 1 0 1 0 > 1 0 0 1 0 1 > 1 0 0 1 0 0 > > so the first vector says that I have 6 > elements therefor I have to make a > 6 by 6 matrix and then I have to read > 5 elements from the second > vector , and put 1 in [1,j] where j=2,3,4,5,6 > and put zero elsewhere( i.e. in [1,1]) > and so on. > Any idea how this can be done in R ?Yep. Matrix indices: a<-c(5,2,2,3,3,2) b<-c(2,3,4,5,6,1,3,2,4,3,1,5,1,4,6,1,4) n<-length(a) M<-matrix(0,n,n) M[cbind(rep(1:n,a),b)]<-1 -- O__ ---- Peter Dalgaard Blegdamsvej 3 c/ /'_ --- Dept. of Biostatistics 2200 Cph. N (*) \(*) -- University of Copenhagen Denmark Ph: (+45) 35327918 ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: (+45) 35327907 -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._
boy I get impressed with some of these responses. John Strumila>> Any idea how this can be done in R ? > > Yep. Matrix indices: > > a<-c(5,2,2,3,3,2) > b<-c(2,3,4,5,6,1,3,2,4,3,1,5,1,4,6,1,4) > > n<-length(a) > M<-matrix(0,n,n) > M[cbind(rep(1:n,a),b)]<-1 > > -- > O__ ---- Peter Dalgaard Blegdamsvej 3 > c/ /'_ --- Dept. of Biostatistics 2200 Cph. N > (*) \(*) -- University of Copenhagen Denmark Ph: > (+45) 35327918 > ~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk) FAX: > (+45) 35327907-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._