[R] substr not by position but by symbol
Rui Barradas
ruipbarradas at sapo.pt
Mon May 7 16:04:36 CEST 2012
Hello,
YN wrote
>
> Hi all,
>
> One of my variables looks like this:
>
> .7_-.3_-.2_.9
>
> And this is a character variable. I made this by combining four different
> number like .7, -.3, -.2, and .9 using paste function.
> Now, I want to go back to original format from this one combined character
> variable. For instance, I want to extract 3rd number, -.2, from this
> character.
>
> I know I can use substr function, but each position is not fixed because
> sometimes each number has negative sign. Instead, it would be good if
> there
> is any extracting function which can extract character not by position but
> by specific symbol, in my case symbol '_'. Is there any similar function
> for doing in R?
>
> Thanks!
>
> YN
>
> [[alternative HTML version deleted]]
>
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> and provide commented, minimal, self-contained, reproducible code.
>
Yes there is.
x <- ".7_-.3_-.2_.9"
strsplit(x, "_")
# To get the numbers, not character vectors
as.numeric(unlist(strsplit(x, "_")))
# Or
sapply(strsplit(x, "_"), as.numeric)
Hope this helps,
Rui Barradas
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