[R] using grep

[Gabor Grothendieck]

Here it is using strapply in gsubfn. x is the input, followed by the
regular expression which is just New York followed by a parenthesized
string of digits.  The parenthesized portion is passed to the
function, as.numeric, and then everything is simplified using c
(otherwise we would get a list as in similar R core functions such as
strsplit).

> strapply(x, "New York(\\d+)", as.numeric, simplify = c)
[1] 722  20

On Sat, Feb 27, 2010 at 12:25 PM, Greg Snow <Greg.Snow at imail.org> wrote:
> Look at the gsubfn package, it gives more options and will probably make what you are trying to do easier.
>
> --
> Gregory (Greg) L. Snow Ph.D.
> Statistical Data Center
> Intermountain Healthcare
> greg.snow at imail.org
> 801.408.8111
>
>
>> -----Original Message-----
>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
>> project.org] On Behalf Of kayj
>> Sent: Friday, February 26, 2010 11:27 AM
>> To: r-help at r-project.org
>> Subject: [R] using grep
>>
>>
>> Hi All,
>>
>> I have a character vector with naems of cities in the us. I need to
>> extract
>> the number that appear after the word "New York", for example,
>>
>> x<-c("P Los Angeles44AZ", "P New York722AZ", "K New York20")
>>
>> I want the results to be
>>
>> 722, 20
>>
>>
>> cab I use the grep function, if so how?
>> I appreciate your help, thanks,
>>
>> --
>> View this message in context: http://n4.nabble.com/using-grep-
>> tp1571102p1571102.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
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>
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>