I did a very quick search of the archive and couldn't find a readily
available answer to this one:
I'd like to convert, for example:
c("a", "b", "a", "b")
to
c(1, -1, 1, -1)
In the case of the first vector, it may be any length, but will always
only have two unique values. It must always be replaced by
corresponding values of 1 and -1.
Any thoughts?
Thanks in advance,
Jake
Duh! sub() --Jake On Jun 22, 2005, at 3:35 PM, Jake Michaelson wrote:> I did a very quick search of the archive and couldn't find a readily > available answer to this one: > > I'd like to convert, for example: > > c("a", "b", "a", "b") > > to > > c(1, -1, 1, -1) > > In the case of the first vector, it may be any length, but will always > only have two unique values. It must always be replaced by > corresponding values of 1 and -1. > > Any thoughts? > > Thanks in advance, > > Jake > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html >
This works
x<-c("a", "b", "a", "b")
x[x=="a"]<-1
x[x=="b"]<- -1
as.numeric(x)
[1] 1 -1 1 -1
________________________________
Fra: r-help-bounces at stat.math.ethz.ch p?? vegne af Jake Michaelson
Sendt: on 22-06-2005 23:35
Til: R-help at stat.math.ethz.ch
Emne: [R] string/character to number
I did a very quick search of the archive and couldn't find a readily
available answer to this one:
I'd like to convert, for example:
c("a", "b", "a", "b")
to
c(1, -1, 1, -1)
In the case of the first vector, it may be any length, but will always
only have two unique values. It must always be replaced by
corresponding values of 1 and -1.
Any thoughts?
Thanks in advance,
Jake
______________________________________________
R-help at stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
You can do indexing by name:> x <- c("a", "b", "a", "b") > v <- c(a=1, b=-1) > v[x]a b a b 1 -1 1 -1 Andy> From: Jake Michaelson > > Duh! > > sub() > > --Jake > > On Jun 22, 2005, at 3:35 PM, Jake Michaelson wrote: > > > I did a very quick search of the archive and couldn't find a readily > > available answer to this one: > > > > I'd like to convert, for example: > > > > c("a", "b", "a", "b") > > > > to > > > > c(1, -1, 1, -1) > > > > In the case of the first vector, it may be any length, but > will always > > only have two unique values. It must always be replaced by > > corresponding values of 1 and -1. > > > > Any thoughts? > > > > Thanks in advance, > > > > Jake > > > > ______________________________________________ > > R-help at stat.math.ethz.ch mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide! > > http://www.R-project.org/posting-guide.html > > > > ______________________________________________ > R-help at stat.math.ethz.ch mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide! > http://www.R-project.org/posting-guide.html > > >