[R] learning R
Fuchs Ira
irafuchs at gmail.com
Wed Feb 25 05:36:17 CET 2009
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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