[R] options other than regex

[Evan Cooch]

Thanks, another good idea.

On 5/25/2018 11:30 AM, PIKAL Petr wrote:
> 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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