Menu
Using R, I have a vector such as
a <- c(0.1,0.6,23,Inf,NaN)
I would like to convert it to something like
c("Finite","Finite","Finite","Inf","NaN")
with as little pain as possible. How is this done?
Thanks! Uri
465
For converting a numeric into factor we use cut() function.
Inf and -Inf are positive and negative infinity whereas NaN means 'Not a Number'. (These apply to numeric values and real and imaginary parts of complex values but not to values of integer vectors.) Inf and NaN are reserved words in the R language.
To check the NaN value in R, use the is. nan() function. That is it for infinity in the R tutorial.
is. infinite() Function in R Language is used to check if the vector contains infinite values as elements. It returns a boolean value for all the elements of the vector.
ifelse() seems to work reasonably well:
b <- ifelse(is.finite(a), "Finite", ifelse(is.infinite(a), "Infinite", "NaN"))
> b
[1] "Finite" "Finite" "Finite" "Infinite" "NaN"
Technically, that returns a character vector, which can be converted with as.factor() or just wrap factor() around the initial call to return a factor to begin with...though character may suit your needs depending on what you need to do.
154
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
