options other than regex
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 Tento e-mail a jak?koliv k n?mu p?ipojen? dokumenty jsou d?v?rn? a podl?haj? tomuto pr?vn? z?vazn?mu prohl??en? o vylou?en? odpov?dnosti: https://www.precheza.cz/01-dovetek/ | This email and any documents attached to it may be confidential and are subject to the legally binding disclaimer: https://www.precheza.cz/en/01-disclaimer/
-----Original Message-----
From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Evan Cooch
Sent: Friday, May 25, 2018 3:43 PM
To: R-help <r-help at 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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