R help - Jan 2012 - help to slip a file name using "strsplit" function

Dear Researchers,

I have several files as this example: Myfile_MyArea1_sample1.txt

i wish to split in "Myfile", "MyArea1", "sample1",
and "txt", becasue i
need to use "sample1" label. I try to use "strsplit" but I
am able just to
split as "Myfile_MyArea1_sample1" and "txt" OR
"Myfile", "MyArea1",
"sample1.txt" using


strsplit(as.character("Myfile_MyArea1_sample1.txt"), ".",
fixed = TRUE)
strsplit(as.character("Myfile_MyArea1_sample1.txt"), "_",
fixed = TRUE)

Thanks in advance

Gianni

	[[alternative HTML version deleted]]

Hi Gianni,

Your first example works fine, though you have unnecessary stuff in it:
strsplit("Myfile_MyArea1_sample1.txt", "_")
[[1]]
[1] "Myfile"      "MyArea1"     "sample1.txt"

The second example doesn't work because of two things: the period is a 
special character, and the fixed argument should be false:
strsplit("Myfile_MyArea1_sample1.txt", "\\.")
[[1]]
[1] "Myfile_MyArea1_sample1" "txt"

HTH,
Ivan


-------- Message original --------
Sujet: 	[R] help to slip a file name using "strsplit" function
Date : 	Wed, 25 Jan 2012 16:26:11 +0100
De : 	gianni lavaredo <gianni.lavaredo at gmail.com>
Pour : 	r-help at r-project.org



Dear Researchers,

I have several files as this example: Myfile_MyArea1_sample1.txt

i wish to split in "Myfile", "MyArea1", "sample1",
and "txt", becasue i
need to use "sample1" label. I try to use "strsplit" but I
am able just to
split as "Myfile_MyArea1_sample1" and "txt" OR
"Myfile", "MyArea1",
"sample1.txt" using


strsplit(as.character("Myfile_MyArea1_sample1.txt"), ".",
fixed = TRUE)
strsplit(as.character("Myfile_MyArea1_sample1.txt"), "_",
fixed = TRUE)

Thanks in advance

Gianni

	[[alternative HTML version deleted]]

______________________________________________
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.




-- 
Ivan CALANDRA
Universit? de Bourgogne
UMR CNRS/uB 6282 Biog?osciences
6 Boulevard Gabriel
21000 Dijon, FRANCE
+33(0)3.80.39.63.06
ivan.calandra at u-bourgogne.fr

On Wed, Jan 25, 2012 at 10:26 AM, gianni lavaredo
<gianni.lavaredo at gmail.com> wrote:
> Dear Researchers,
>
> I have several files as this example: Myfile_MyArea1_sample1.txt
>
> i wish to split in "Myfile", "MyArea1",
"sample1", and "txt", becasue i
> need to use "sample1" label. I try to use "strsplit"
but I am able just to
> split as "Myfile_MyArea1_sample1" and "txt" OR
"Myfile", "MyArea1",
> "sample1.txt" using
>
>
> strsplit(as.character("Myfile_MyArea1_sample1.txt"),
".", fixed = TRUE)
> strsplit(as.character("Myfile_MyArea1_sample1.txt"),
"_", fixed = TRUE)
>
Replace the . with _ and then strsplit on _ like this:
> strsplit(chartr(".", "_",
"Myfile_MyArea1_sample1.txt"), "_")[[1]]
[1] "Myfile"  "MyArea1" "sample1" "txt"

If the idea is just to extract "sample1" then try replacing everything
up to the last _ and everything from the dot onwards with empty
strings like this:
> gsub(".*_|[.].*", "",
"Myfile_MyArea1_sample1.txt")
[1] "sample1"


-- 
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com

How about:
unlist(strsplit(as.character("Myfile_MyArea1_sample1.txt"), split = 
'[[:punct:]]'))

-----Original Message----- 
From: gianni lavaredo
Sent: Wednesday, January 25, 2012 9:26 AM
To: r-help at r-project.org
Subject: [R] help to slip a file name using "strsplit" function

Dear Researchers,

I have several files as this example: Myfile_MyArea1_sample1.txt

i wish to split in "Myfile", "MyArea1", "sample1",
and "txt", becasue i
need to use "sample1" label. I try to use "strsplit" but I
am able just to
split as "Myfile_MyArea1_sample1" and "txt" OR
"Myfile", "MyArea1",
"sample1.txt" using


strsplit(as.character("Myfile_MyArea1_sample1.txt"), ".",
fixed = TRUE)
strsplit(as.character("Myfile_MyArea1_sample1.txt"), "_",
fixed = TRUE)

Thanks in advance

Gianni

[[alternative HTML version deleted]]

______________________________________________
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.


------------------------------------------
Robert W. Baer, Ph.D.
Professor of Physiology
Kirksville College of Osteopathic Medicine
A. T. Still University of Health Sciences
800 W. Jefferson St.
Kirksville, MO 63501
660-626-2322
FAX 660-626-2965

On Wed, Jan 25, 2012 at 10:51 AM, Gabor Grothendieck
<ggrothendieck at gmail.com> wrote:
> On Wed, Jan 25, 2012 at 10:26 AM, gianni lavaredo
> <gianni.lavaredo at gmail.com> wrote:
>> Dear Researchers,
>>
>> I have several files as this example: Myfile_MyArea1_sample1.txt
>>
>> i wish to split in "Myfile", "MyArea1",
"sample1", and "txt", becasue i
>> need to use "sample1" label. I try to use
"strsplit" but I am able just to
>> split as "Myfile_MyArea1_sample1" and "txt" OR
"Myfile", "MyArea1",
>> "sample1.txt" using
>>
>>
>> strsplit(as.character("Myfile_MyArea1_sample1.txt"),
".", fixed = TRUE)
>> strsplit(as.character("Myfile_MyArea1_sample1.txt"),
"_", fixed = TRUE)
>>
>
> Replace the . with _ and then strsplit on _ like this:
>
>> strsplit(chartr(".", "_",
"Myfile_MyArea1_sample1.txt"), "_")[[1]]
> [1] "Myfile" ?"MyArea1" "sample1"
"txt"
>
> If the idea is just to extract "sample1" then try replacing
everything
> up to the last _ and everything from the dot onwards with empty
> strings like this:
>
>> gsub(".*_|[.].*", "",
"Myfile_MyArea1_sample1.txt")
> [1] "sample1"
>
Actually the strsplit above could be shortened to:
> strsplit("Myfile_MyArea1_sample1.txt", "[._]")[[1]]
[1] "Myfile"  "MyArea1" "sample1" "txt"

-- 
Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com