[R] Splitting a character vector.

[Rui Barradas]

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: ruipbarradas at sapo.pt
>> Sent: Sat, 07 Jul 2012 23:08:19 +0100
>> To: jrkrideau at 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: ruipbarradas at sapo.pt
>>>> Sent: Sat, 07 Jul 2012 22:55:41 +0100
>>>> To: jrkrideau at 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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>
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