> x <- c(1,1,1,2,2,3,4,4,5)
> x[x %in% 1:3]
[1] 1 1 1 2 2 3
So ...
> x[x %in% 1:3] <- 1
> x
[1] 1 1 1 1 1 1 4 4 5
On Jan 17, 2009, at 12:03 PM, Jörg Groß wrote:
Hi,
If I have following vector;
x <- c(1,1,1,2,2,3,4,4,5)
and I want to change values in the range of 1 to 3 into the value 1,
how can I do that?
I tried
x[x == c(1:3)] <- c(1)
but than I get;
x
[1] 1 1 1 2 1 1 4 4 5
R doesn't change the 2 into a 1.
But why?
It appears to be the result of with argument recycling. If you change
the problem to one where the length of x is not a multiple of the
other side of the equality, you get a warning that is typical for that
sort of problem:
> x <- c(1,1,1,2,2,3,3,3,4,4,5)
>
>
>
> x[x == c(1:3)]
[1] 1 2 3
Warning message:
In x == c(1:3) :
longer object length is not a multiple of shorter object length
> x[x == c(1:3)] <- c(1)
Warning message:
In x == c(1:3) :
longer object length is not a multiple of shorter object length
>
> x
[1] 1 1 1 2 1 1 3 3 4 4 5
I think it is testing these equalities with the matches having a up-
caret.
1 1 1 2 2 3 3 3 4 4 5
1 2 3 1 2 3 1 2 3 1 2
^ ^
--
David Winsemius
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and provide commented, minimal, self-contained, reproducible code.
