Explanation w.r.t. rbind, please!
-----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Uwe Dippel Sent: Freitag, 29. Januar 2010 11:57 To: r-help at r-project.org Subject: [R] Explanation w.r.t. rbind, please! This is what I tried:
> num.vec <- c(12.34,56.78,90.12,34.56) >
names(num.vec)<-c("first","second","third","fourth")
> num.vec
first second third fourth 12.34 56.78 90.12 34.56
> seq<-(1:4) > num.mat<-rbind(num.vec,seq) > num.mat
first second third fourth num.vec 12.34 56.78 90.12 34.56 seq 1.00 2.00 3.00 4.00
> num.vec [3:4]
third fourth 90.12 34.56 (until here I'm fine)
> num.mat [seq]
[1] 12.34 1.00 56.78 2.00
What you (probably) want here is num.mat ["seq",]
> num.mat [num.vec]
[1] NA NA NA NA
num.mat["num.vec",] and so on. You have to use tell R that you want the ROW (that's why the comma is needed) defined by the NAME "seq" or "num.vec" (that's why you need "") . Otherwise, R replaces seq by its value 1:4, so num.mat[seq] is identical to num.mat[1:4] (and num.mat[12.34] is NA of course in num.mat[num.vec]) You should have a closer look at ?Extract HTH, Michael
> num.vec [seq]
first second third fourth 12.34 56.78 90.12 34.56
> num.mat [num.vec]
[1] NA NA NA NA
> num.mat [-seq]
[1] 90.12 3.00 34.56 4.00 (and here I'm lost!) How could I display a row, instead of always seemingly falling back to columns? Uwe
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