List to Integer or Double in R
I Have a List of About 1000 Single Integers. I Need to Be Able to Do Some Mathematical Computations, but They're Stuck in List or Character Form. How Can I...
I have a list of about 1000 single integers. I need to be able to do some mathematical computations, but they're stuck in list or character form. How can I switch them so they're usable?
sample data:
> y [[1]]
[1] "7" "3" "1" "6" "7" "1" "7" "6" "5" "3" "1" "3" "3" "0" "6" "2" "4" "9"
[19] "1" "9" "2" "2" "5" "1" "1" "9" "6" "7" "4" "4" "2" "6" "5" "7" "4" "7"
[37] "4" "2" "3" "5" "5" "3" "4" "9" "1" "9" "4" "9" "3" "4" "9" "6" "9" "8"
[55] "3" "5" "2" "0" "3" "1" "2" "7" "7" "4" "5" "0" "6" "3" "2" "6" "2" "3"
[73] "9" "5" "7" "8" "3" "1" "8" "0" "1" "6" "9" "8" "4" "8" "0" "1" "8" "6" ...
Just the first couple of lines.
2 Answers
See ?unlist :
> x
[[1]]
[1] "1"
[[2]]
[1] "2"
[[3]]
[1] "3"
> y <- as.numeric(unlist(x))
> y
[1] 1 2 3
If this doesn't solve your problem, please specify what exactly you want to do.
edit : It's even simpler apparently :
> x <- list(as.character(1:3))
> x
[[1]]
[1] "1" "2" "3"
> y <-as.numeric(x[[1]])
> y
[1] 1 2 3
Try this -- combining as.numeric() and rbind():
> foo <- list("2", "4", "7")
> foo
[[1]]
[1] "2"
[[2]]
[1] "4"
[[3]]
[1] "7"
> bar <- do.call(rbind, lapply(foo, as.numeric))
> bar
[,1]
[1,] 2
[2,] 4
[3,] 7
>
Marcus Vance is a cybersecurity auditor and technology writer dedicated to educating the public about online safety, data privacy regulations, enterprise security, and emerging cyber threats.
