[R] options other than regex

[PIKAL Petr]

Hi
I am not sure if it is more readable

> paste(paste(unlist(strsplit(x,"")),".", sep=""), collapse="")
[1] "1.0.1.1.0.1.1.1."

If you did not want last dot, it is a bit shorter.
> paste(unlist(strsplit(x,"")),collapse=".")
[1] "1.0.1.1.0.1.1.1"
>

Cheers
Petr
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> -----Original Message-----
> From: R-help [mailto:r-help-bounces using r-project.org] On Behalf Of Evan Cooch
> Sent: Friday, May 25, 2018 3:43 PM
> To: R-help <r-help using r-project.org>
> Subject: [R] options other than regex
>
> Hi --
>
> I'm looking for alternatives to regex for a fairly simply 'reformatting'
> problem. Alternatives only because a lot of folks have trouble
> parsing/interpreting regex expressions, and I'm looking for suggestions for
> something more 'transparent'.
>
> Here is an example of what I'm trying to do. Take the following string, which I
> call x, and for each character in the string, replace that character with the
> character, followed by a decimal. The following big of regex works...and
> illustrates the reformatting I'm after:
>
> x <- '10110111'
> print(x)
>
> y <- sub("\\s+$", "", gsub('(.{1})', '\\1.', x))
> print(y)
>
> I had a look at formatC or prettyNum as another way to get there from here,
> but couldn't get it to work:
>
> x <- '10110111'
> hold <- prettyNum(as.numeric(x), big.mark = ".", big.interval = 1,
>          format = "d", flag = "0", width = nchar(x))
> print(hold)
>
>
> I tried making big.mark a decimal, but that fails, since it confuses 'prettyNum'.
> OK, so I try a 2-step approach
>
> x <- '10110111'
> hold <- prettyNum(as.numeric(x), big.mark = "x", big.interval = 1,
>          format = "d", flag = "00", width = nchar(x))
> hold2 <- (gsub("x",".",hold))
> print(hold2)
>
> Seems to work, but...doesn't work (at least, based on what I tried) if the first
> character(s) in the string are 0's. [Whereas the regex approach handles this just
> fine...]
>
>
> x <- '0010110111'
> hold <- prettyNum(as.numeric(x), big.mark = "x", big.interval = 1,
>          format = "d", flag = "00", width = nchar(x))
> hold2 <- (gsub("x",".",hold))
> print(hold2)
>
>
> Basically, it strips off the leading 0's. I'm sure I'm missing something with
> prettyNum/formatC, but I'm also guessing there are alternatives.
> Suggestions?
>
> Thanks in advance.
>
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