Convert string of integer sequence to integer sequence

Question

Suppose I have the element

    x <- "1:4"

I try to convert x into a sequence as follow

    as.integer(x)
    [1] NA
    Warning message:
    NAs introduced by coercion

How can I get an integer sequence beginning from a string?

` eval(parse(text = "1:4"))` – G. Grothendieck Jan 11 '17 at 23:10 — G. Grothendieck, Jan 11 '17 at 23:10

score 0 · Answer 1 · answered Jan 11 '17 at 23:10

0

When you type x <- "1:4" you are not creating a string of 4 characters 1, 2, 3, and 4. You are creating a string that's simply "1:4". Naturally when you convert this to numbers, it makes no sense. Hence you want x <- 1:4.

answered Jan 11 '17 at 23:10

Gaurav Bansal

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1

here the reason of my question https://stackoverflow.com/questions/41595942/convert-list-of-list-to-a-coerced-dataframe?noredirect=1#comment70395772_41595942 – BillyLeZeurbé Jan 11 '17 at 23:40

score 0 · Answer 2 · answered Jan 11 '17 at 23:13

EDIT: Gaurav beat me to this.

Firstly, x<-"1:4" will be saved as "1:4"

x<-"1:4"
str(x)
    chr "1:4"

Therefore it cannot be turned into an integer, it is merely saved as characters. You first need to remove the "" from the x<-"1:4" at which point you'll by default get a list of 4 integers 1:4 :

x<-1:4
str(x)
   int [1:4] 1 2 3 4

Convert string of integer sequence to integer sequence

2 Answers2