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arnaud Gaboury

2010-Apr-23 15:57 UTC

[R] substract start from the end of the vector

Dear group,

 

Here is my df :

 

df <-

structure(list(DESCRIPTION = c("PRM HGH GD ALUMINIUM USD 09/07/10 ", 

"PRM HGH GD ALUMINIUM USD 09/07/10 ", "PRIMARY NICKEL USD
04/06/10 "

), CREATED.DATE = structure(c(18361, 18361, 18325), class = "Date"), 

    QUANITY = c(-1L, 1L, 1L), CLOSING.PRICE = c("2,415.90",
"2,415.90",

    "25,755.71")), .Names = c("DESCRIPTION",
"CREATED.DATE",

"QUANITY", "CLOSING.PRICE"), row.names = c(NA, 3L), class =
"data.frame")
> 
> df
                         DESCRIPTION                   CREATED.DATE
QUANITY          CLOSING.PRICE

1 PRM HGH GD ALUMINIUM USD 09/07/10    2020-04-09               -1
2,415.90

2 PRM HGH GD ALUMINIUM USD 09/07/10    2020-04-09                1
2,415.90

3              PRIMARY NICKEL USD 04/06/10    2020-03-04                1
25,755.71

 

 

 

In the DESCRIPTION column, I want to get rid of the date (09/07/10 .). I
know the function substr(x, start, stop), but in my case, I need to indicate
I want to start from the end of the vector, and I have no idea how to pass
this argument. 
 
TY for any help

 

 

 

 

 

 

***************************

Arnaud Gaboury

Mobile: +41 79 392 79 56

BBM: 255B488F

***************************

 


	[[alternative HTML version deleted]]

Chuck Cleland

2010-Apr-23 16:06 UTC

head link

[R] substract start from the end of the vector

with(df, substr(DESCRIPTION, start=1, stop=nchar(DESCRIPTION) - 10))

?nchar

On 4/23/2010 11:57 AM, arnaud Gaboury wrote:> Dear group,
> 
>  
> 
> Here is my df :
> 
>  
> 
> df <-
> 
> structure(list(DESCRIPTION = c("PRM HGH GD ALUMINIUM USD 09/07/10
",
> 
> "PRM HGH GD ALUMINIUM USD 09/07/10 ", "PRIMARY NICKEL USD
04/06/10 "
> 
> ), CREATED.DATE = structure(c(18361, 18361, 18325), class =
"Date"),
> 
>     QUANITY = c(-1L, 1L, 1L), CLOSING.PRICE = c("2,415.90",
"2,415.90",
> 
>     "25,755.71")), .Names = c("DESCRIPTION",
"CREATED.DATE",
> 
> "QUANITY", "CLOSING.PRICE"), row.names = c(NA, 3L),
class = "data.frame")
> 
> 
>> df
> 
>                          DESCRIPTION                   CREATED.DATE
> QUANITY          CLOSING.PRICE
> 
> 1 PRM HGH GD ALUMINIUM USD 09/07/10    2020-04-09               -1
> 2,415.90
> 
> 2 PRM HGH GD ALUMINIUM USD 09/07/10    2020-04-09                1
> 2,415.90
> 
> 3              PRIMARY NICKEL USD 04/06/10    2020-03-04                1
> 25,755.71
> 
>  
> 
>  
> 
>  
> 
> In the DESCRIPTION column, I want to get rid of the date (09/07/10 .). I
> know the function substr(x, start, stop), but in my case, I need to
indicate
> I want to start from the end of the vector, and I have no idea how to pass
> this argument. 
>  
> TY for any help
> 
>  
> 
>  
> 
>  
> 
>  
> 
>  
> 
>  
> 
> ***************************
> 
> Arnaud Gaboury
> 
> Mobile: +41 79 392 79 56
> 
> BBM: 255B488F
> 
> ***************************
> 
>  
> 
> 
> 	[[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. 
-- 
Chuck Cleland, Ph.D.
NDRI, Inc. (www.ndri.org)
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 512-0171 (M, W, F)
fax: (917) 438-0894

jim holtman

2010-Apr-23 16:09 UTC

head link

[R] substract start from the end of the vector

Use regular expressions:
> df$newDesc <- sub("(\\d+/\\d+/\\d
<file://d+///d+///d>+)", '',
df$DESCRIPTION)> df                         DESCRIPTION CREATED.DATE QUANITY
CLOSING.PRICE                    newDesc
1 PRM HGH GD ALUMINIUM USD 09/07/10    2020-04-09      -1      2,415.90 PRM
HGH GD ALUMINIUM USD
2 PRM HGH GD ALUMINIUM USD 09/07/10    2020-04-09       1      2,415.90 PRM
HGH GD ALUMINIUM USD
3       PRIMARY NICKEL USD 04/06/10    2020-03-04       1
25,755.71       PRIMARY NICKEL USD



On Fri, Apr 23, 2010 at 11:57 AM, arnaud Gaboury
<arnaud.gaboury@gmail.com>wrote:
> Dear group,
>
>
>
> Here is my df :
>
>
>
> df <-
>
> structure(list(DESCRIPTION = c("PRM HGH GD ALUMINIUM USD 09/07/10
",
>
> "PRM HGH GD ALUMINIUM USD 09/07/10 ", "PRIMARY NICKEL USD
04/06/10 "
>
> ), CREATED.DATE = structure(c(18361, 18361, 18325), class =
"Date"),
>
>    QUANITY = c(-1L, 1L, 1L), CLOSING.PRICE = c("2,415.90",
"2,415.90",
>
>    "25,755.71")), .Names = c("DESCRIPTION",
"CREATED.DATE",
>
> "QUANITY", "CLOSING.PRICE"), row.names = c(NA, 3L),
class = "data.frame")
>
> >
>
> > df
>
>                         DESCRIPTION                   CREATED.DATE
> QUANITY          CLOSING.PRICE
>
> 1 PRM HGH GD ALUMINIUM USD 09/07/10    2020-04-09               -1
> 2,415.90
>
> 2 PRM HGH GD ALUMINIUM USD 09/07/10    2020-04-09                1
> 2,415.90
>
> 3              PRIMARY NICKEL USD 04/06/10    2020-03-04                1
> 25,755.71
>
>
>
>
>
>
>
> In the DESCRIPTION column, I want to get rid of the date (09/07/10 .). I
> know the function substr(x, start, stop), but in my case, I need to
> indicate
> I want to start from the end of the vector, and I have no idea how to pass
> this argument.
>
> TY for any help
>
>
>
>
>
>
>
>
>
>
>
>
>
> ***************************
>
> Arnaud Gaboury
>
> Mobile: +41 79 392 79 56
>
> BBM: 255B488F
>
> ***************************
>
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help@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<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 that you are trying to solve?

	[[alternative HTML version deleted]]

Steve Lianoglou

2010-Apr-23 16:10 UTC

head link

[R] substract start from the end of the vector

Hi,

On Fri, Apr 23, 2010 at 11:57 AM, arnaud Gaboury
<arnaud.gaboury at gmail.com> wrote:> Dear group,
>
> Here is my df :
>
> df <-
>
> structure(list(DESCRIPTION = c("PRM HGH GD ALUMINIUM USD 09/07/10
",
>
> "PRM HGH GD ALUMINIUM USD 09/07/10 ", "PRIMARY NICKEL USD
04/06/10 "
>
> ), CREATED.DATE = structure(c(18361, 18361, 18325), class =
"Date"),
>
> ? ?QUANITY = c(-1L, 1L, 1L), CLOSING.PRICE = c("2,415.90",
"2,415.90",
>
> ? ?"25,755.71")), .Names = c("DESCRIPTION",
"CREATED.DATE",
>
> "QUANITY", "CLOSING.PRICE"), row.names = c(NA, 3L),
class = "data.frame")
>
>>
>
>> df
>
> ? ? ? ? ? ? ? ? ? ? ? ? DESCRIPTION ? ? ? ? ? ? ? ? ? CREATED.DATE
> QUANITY ? ? ? ? ?CLOSING.PRICE
>
> 1 PRM HGH GD ALUMINIUM USD 09/07/10 ? ?2020-04-09 ? ? ? ? ? ? ? -1
> 2,415.90
>
> 2 PRM HGH GD ALUMINIUM USD 09/07/10 ? ?2020-04-09 ? ? ? ? ? ? ? ?1
> 2,415.90
>
> 3 ? ? ? ? ? ? ?PRIMARY NICKEL USD 04/06/10 ? ?2020-03-04 ? ? ? ? ? ? ? ?1
> 25,755.71
>
> In the DESCRIPTION column, I want to get rid of the date (09/07/10 .). I
> know the function substr(x, start, stop), but in my case, I need to
indicate
> I want to start from the end of the vector, and I have no idea how to pass
> this argument.
>
> TY for any help
How about using a regular expression:

R> gsub(" *(\\d+/\\d+/\\d+)$", "", "HGH GD ALUMINIUM
USD 09/07/10", perl=TRUE)
[1] "HGH GD ALUMINIUM USD"

And to replace your DESCRIPTION clolumn

R> df$DESCRIPTION <- gsub(" *(\\d+/\\d+/\\d+) *$", "",
df$DESCRIPTION)
R> df
               DESCRIPTION CREATED.DATE QUANITY CLOSING.PRICE
1 PRM HGH GD ALUMINIUM USD   2020-04-09      -1      2,415.90
2 PRM HGH GD ALUMINIUM USD   2020-04-09       1      2,415.90
3       PRIMARY NICKEL USD   2020-03-04       1     25,755.71

I'm also removing leading/trailing spaces around your date to strip
out any trailing whitespace.

HTH,
-steve

-- 
Steve Lianoglou
Graduate Student: Computational Systems Biology
 | Memorial Sloan-Kettering Cancer Center
 | Weill Medical College of Cornell University
Contact Info: http://cbio.mskcc.org/~lianos/contact

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