[R] Difficultes with grep

[Fran100681]

Thank you very much for all messages and answers, it's ok now :)



Charles C. Berry wrote:
> 
> On Sun, 13 Jul 2008, Fran100681 wrote:
> 
>>
>> Thank you, but this is not what i want exactly.. i would want to launch
>> function "myfun" with this script:
>>
>>> table <- sample(LETTERS[1:5], 20,TRUE)
>>>
>>> name <- "A"
>>>
>>> myfun <- function(name) {
>> + r <- grep (name[^0-9], table )
> ...............XXXXXXXXXX............
> 
> 
> This is not correct syntax. And likely R told you so.
> 
> If you intend "name[^0-9]" to be read as character, you need to quote it.
> 
> Perhaps you want a more complicated regex than the one Jim handed you, 
> like
> 
>  	name <- "A[^0-9]"
> 
> ??
> 
> 
>> + return (r) }
>>
>> but if I do it ,R doesn't accept this.. i want this because i have in
>> "table" (a data frame) ,a list of element that are "hsa-mir-N" (when N is
>> any number)..so, if i put in argument "name" this is: "hsa-mir-70"
>> ,function
>> matches hsa-mir-70, but also (for instance) hsa-mir-700, 710 724 and so
>> on... infact i insert a square brackets ^0-9 to exclude any other number
>> after those i have given (in "name").. It's a little complex situation..
>> :(
>>
>> p.s: i can't put in "name" simply: hsa-mir-20 to match all hsa-mir-20 in
>> the
>> data frame because i need to match hsa-mir-20 but also (for instance)
>> hsa-mir-20-3... or hsa-mir-20b, hsa-mir-20a..... and not those elements
>> with
>> another number after the 20
>>
>>
>> jholtman wrote:
>>>
>>> I think this is what you want
>>>
>>>> table <- sample(LETTERS[1:5], 20,TRUE)
>>>>
>>>> name <- "A"
>>>>
>>>> myfun <- function(name) {
>>> + r <- grep (name, table )
>>> + return (r) }
>>>>
>>>> myfun(name)
>>> [1]  4  7 14 18
>>>> table
>>>  [1] "E" "B" "D" "A" "B" "B" "A" "B" "E" "B" "C" "C" "C" "A" "E" "D"
>>> "D" "A" "D" "C"
>>>>
>>>
>>>
>>> On Fri, Jul 11, 2008 at 1:57 PM, Fran100681 <franaruto at hotmail.it>
>>> wrote:
>>>>
>>>> Hello everybody!
>>>>
>>>> I'm using R and I have a little problem about function "grep". I 've
>>>> got
>>>> to
>>>> make a new function in which "grep" is present. So the first argument
>>>> of
>>>> "grep" is the string we want to find,ok..but in this case I define a
>>>> function "x" before , x receives an argument in a object "name" (for
>>>> instance), then inside function "x" ,i  define a grep.. so i want to
>>>> set
>>>> as
>>>> pattern (1st argument of grep)  what i put in "name" and not the string
>>>> "name"... how do i do that?
>>>>
>>>> ex:
>>>> name <- "Tom"
>>>>
>>>> myfun <- function(name) {
>>>> r <- grep ("name", table )
>>>> return (r) }
>>>> It returns nothing because it searches the word "name" in "table"
>>>> rather
>>>> "Tom"...
>>>> I hope to receive some little help because this is stopping me in my
>>>> projcet
>>>> :/ ... i m'not able to reach a solution! Thanks a lot!
>>>> --
>>>> View this message in context:
>>>> http://www.nabble.com/Difficultes-with-grep-tp18409347p18409347.html
>>>> Sent from the R help mailing list archive at Nabble.com.
>>>>
>>>> ______________________________________________
>>>> R-help at r-project.org mailing list
>>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>>> PLEASE do read the posting guide
>>>> http://www.R-project.org/posting-guide.html
>>>> and provide commented, minimal, self-contained, reproducible code.
>>>>
>>>
>>>
>>>
>>> --
>>> Jim Holtman
>>> Cincinnati, OH
>>> +1 513 646 9390
>>>
>>> What is the problem you are trying to solve?
>>>
>>> ______________________________________________
>>> R-help at r-project.org mailing list
>>> https://stat.ethz.ch/mailman/listinfo/r-help
>>> PLEASE do read the posting guide
>>> http://www.R-project.org/posting-guide.html
>>> and provide commented, minimal, self-contained, reproducible code.
>>>
>>>
>>
>> -- 
>> View this message in context:
>> http://www.nabble.com/Difficultes-with-grep-tp18409347p18428404.html
>> Sent from the R help mailing list archive at Nabble.com.
>>
>> ______________________________________________
>> R-help at r-project.org mailing list
>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide
>> http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>>
> 
> Charles C. Berry                            (858) 534-2098
>                                              Dept of Family/Preventive
> Medicine
> E mailto:cberry at tajo.ucsd.edu	            UC San Diego
> http://famprevmed.ucsd.edu/faculty/cberry/  La Jolla, San Diego 92093-0901
> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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