Hi Ira:
For your first question, under the hood of R, names<- is actually a
function so , when you do that, you need to say names(a)[2] rather
than names(a[2]). why this is is tricky and I wouldn't do it justice if
i tried to explain it. it's best if you do ?"names<-" at an R prompt and
read that.
For the second one, you can rbind x with anything that of length one and
the recycling concept in R will add the extra now but maybe there's a
better way that someone else will hopefully send.
#==================================================================================
a=c(1,2)
names(a)=c("one","two")
names(a[2])
names(a)[2]<-"too"
names(a)
#===================================================================================
x=c(1,2,3)
y=c(3,4,5)
x <- matrix(x,nrow=1)
print(x)
x <- rbind(x,NA)
x[2,] <- y
print(x)
On Tue, Feb 24, 2009 at 11:36 PM, Fuchs Ira wrote:
I was wondering why the following doesn't work:
a=c(1,2)
names(a)=c("one","two")
a
one two
1 2
names(a[2])
[1] "two"
names(a[2])="too"
names(a)
[1] "one" "two"
a
one two
1 2
I must not be understanding some basic concept here.
Why doesn't the 2nd name change to "too"?
also unrelated: if I have two vectors and I want to combine them to
form a matrix ,is cbind (or rbind) the most direct way to do this?
e.g.
x=c(1,2,3)
y=c(3,4,5)
z=rbind(x,y)
alternatively: is there a way to make a matrix with dim=2,3 and then
to replace the 2nd row with y
something like this (which doesn't work but perhaps there is another
way to do the equivalent?)
attr(x,"dim")=c(2,3)
x[2,]=y
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