R help - May 2006 - conditional replacement

Hi 
   
  How can do this in R.
   
  >df 
   
  48        
  1          
  35        
  32        
  80
   
  If df < 30  then replace it with 30 and else if df > 60 replace it with
60. I have a large dataset so I cant afford to identify indexes and then
replace.
  Desired o/p:
   
  48
  30
  35
  32
  60
   
  Thanx in advance.
   
Sachin
__________________________________________________



	[[alternative HTML version deleted]]

x <- 10*1:10
pmin(pmax(x, 30), 60) #  30 30 30 40 50 60 60 60 60 60


On 5/23/06, Sachin J <sachinj.2006 at yahoo.com>
wrote:
> Hi
>
>  How can do this in R.
>
>  >df
>
>  48
>  1
>  35
>  32
>  80
>
>  If df < 30  then replace it with 30 and else if df > 60 replace it
with 60. I have a large dataset so I cant afford to identify indexes and then
replace.
>  Desired o/p:
>
>  48
>  30
>  35
>  32
>  60
>
>  Thanx in advance.
>
> Sachin
> __________________________________________________
>
>
>
>        [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html
>

On Tue, 2006-05-23 at 11:40 -0700, Sachin J wrote:
> Hi 
>    
>   How can do this in R.
>    
>   >df 
>    
>   48        
>   1          
>   35        
>   32        
>   80
>    
>   If df < 30  then replace it with 30 and else if df > 60 replace it
> with 60. I have a large dataset so I cant afford to identify indexes
> and then replace. 
>   Desired o/p:
>    
>   48
>   30
>   35
>   32
>   60
>    
>   Thanx in advance.
>    
> Sachin
One approach is to combine the use of two ifelse() statements:
> ifelse(df < 30, 30, ifelse(df > 60, 60, df))
[1] 48 30 35 32 60

Recall that if the condition (1st argument) is TRUE, then the second
argument is evaluated and returned.  

If the condition is FALSE, then the third argument is evaluated, which
in this case is another ifelse().  The same logic follows within that
function.

See ?ifelse

HTH,

Marc Schwartz

you could try something like:

ifelse(df < 30, 30, ifelse(df > 60, 60, df))

I hope it helps.

Best,
Dimitris

---- 
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


Quoting Sachin J <sachinj.2006 at yahoo.com>:
> Hi 
>    
>   How can do this in R.
>    
>   >df 
>    
>   48        
>   1          
>   35        
>   32        
>   80
>    
>   If df < 30  then replace it with 30 and else if df > 60 replace it
> with 60. I have a large dataset so I cant afford to identify indexes
> and then replace. 
>   Desired o/p:
>    
>   48
>   30
>   35
>   32
>   60
>    
>   Thanx in advance.
>    
> Sachin
> __________________________________________________
> 
> 
> 
> 	[[alternative HTML version deleted]]
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide!
> http://www.R-project.org/posting-guide.html
> 
> 

Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm

Sachin J wrote:
> Hi 
>    
>   How can do this in R.
>    
>   >df 
>    
>   48        
>   1          
>   35        
>   32        
>   80
>    
>   If df < 30  then replace it with 30 and else if df > 60 replace it
with 60. I have a large dataset so I cant afford to identify indexes and then
replace.
>   Desired o/p:
>    
>   48
>   30
>   35
>   32
>   60
>    
>   Thanx in advance.
>    
> Sachin
> __________________________________________________
> 
> 
Try:

pmax(pmin(df, 60), 30)

assuming "df" is numeric (and not a data.frame). ifelse is also an
option.

--sundar

Sachin,

there's another slower but more flexible way than Gabor's solution:

ifelse(x<30,30,ifelse(x>60,60,x))

HTH,

Rogerio.
----- Original Message ----- 
From: "Sachin J" <sachinj.2006 at yahoo.com>
To: <R-help at stat.math.ethz.ch>
Sent: Tuesday, May 23, 2006 3:40 PM
Subject: [R] conditional replacement

> Hi
>
>  How can do this in R.
>
>  >df
>
>  48
>  1
>  35
>  32
>  80
>
>  If df < 30  then replace it with 30 and else if df > 60 replace it
with
> 60. I have a large dataset so I cant afford to identify indexes and then 
> replace.
>  Desired o/p:
>
>  48
>  30
>  35
>  32
>  60
>
>  Thanx in advance.
>
> Sachin
> __________________________________________________
>
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! 
> http://www.R-project.org/posting-guide.html
>