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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.
249
To convert R List to Numeric value, use the combination of the unlist() function and as. numeric() function. The unlist() function in R produces a vector that contains all the atomic components.
integer : an integer (positive or negative). Many R programmers do not use this mode since every integer value can be represented as a double . double : a real number stored in “double-precision floatint point format.”
double R function converts an integer to the double class. The is. double R function tests whether a data object has the double class.
toString() in R To convert the list to string in R, use the toString() function. The toString() is an inbuilt R function that converts An R Object To a Character String.
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
>
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