It's an empty character string, meant to substitute nothing for
close.par, to get rid of it.
Rui Barradas
Em 07-07-2012 23:17, John Kane escreveu:
No sorry Rui,
In the expression result <- strsplit(sub(close.par, "", dd1), open.par)
there is close.par, ''", open.par
I probably am just blind but I don't understand what it is doing.
John Kane
Kingston ON Canada
-----Original Message-----
From: ruipbarra...@sapo.pt
Sent: Sat, 07 Jul 2012 23:08:19 +0100
To: jrkrid...@inbox.com
Subject: Re: [R] Splitting a character vector.
Hello,
Sorry, but I don't understand, you're asking about 4 single quotes, the
double quotes in open.par are just opening and closing the pattern, a
character string.
Rui Barradas
Em 07-07-2012 23:03, John Kane escreveu:
Thanks Rui
It works perfectly so far on the test and real data.
The annoying thing is that I had tried , or thought I'd tried the
open.par format and keep getting an error.
It looks like I had failed to add the '''', in the term. What is it
doing?
John Kane
Kingston ON Canada
-----Original Message-----
From: ruipbarra...@sapo.pt
Sent: Sat, 07 Jul 2012 22:55:41 +0100
To: jrkrid...@inbox.com
Subject: Re: [R] Splitting a character vector.
Hello,
Try the following.
open.par <- " \\(" # with a blank before '('
close.par <- "\\)"
result <- strsplit(sub(close.par, "", dd1), open.par)
Why the two '\\'? Because '(' is a meta-character so it must be
escaped.
But '\' is a meta character so it must also be escaped.
Then choose the right way to separate the two, maybe something like
ix <- rep(c(TRUE, FALSE), length(result))
unlist(result)[ix]
unlist(result)[!ix]
Hope this helps,
Rui Barradas
Em 07-07-2012 22:37, John Kane escreveu:
I am lousy at simple regex and I have not found a solution to a simple
problem.
I have a vector with some character values that I want to split.
Sample data
dd1 <- c( "XXY (mat harry)","XXY (jim bob)", "CAMP (joe blow)", "ALP
(max jack)")
Desired result
dd2 <- data.frame( xx = c("XXY", "XXY", "CAMP", "ALP"), yy = c("mat
harry", "jim bob" , "joe blow", "max jack"))
I thought I should be able to split the characters with strsplit but
either I am misunderstanding the function or don't know how to escape
a
"(" properly in an effort to at least get "XXY" "(mat harry)"
Any pointers would be appreciated
Thanks
John Kane
Kingston ON Canada
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