R help - Dec 2005 - creating a subset of a dataset using ifelse statement?

I am using R in a Microsoft Windows environment.
   
  I have a dataset called “mp1b”.  I have a variable called h.
   
  h can take a value from -1 to 5.
   
  If h <1, I want to create a new dataset called mp2 that is the same as
mp1b:
   
  “mp2<-mp1b”
   
  If h > 0, I want to set create a dataset mp2, where I limit the original
dataset to those where mp1b$group = =h. similar to:
   
  “mp2<-subset (mp1b, group= = h)”
   
  I have tried this ifelse statement, but it does not seem to work as expected.
   
  “mp2<-ifelse(h<1,mp1b,subset(mp1b,cluster_q==h))”
   
  Assistance is appreciated.

			
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?ifelse     ; it's clear that you can use it in your case.
Where cluster_q is comming from ( I suppose is the column name you want 
to filter by!)?
What if  you use the simpler syntax :
if(h<1)
mp2<-mp1
else
mp2<-subset(mp1b,cluster_q==h)

?

THT

t c wrote:
>I am using R in a Microsoft Windows environment.
>   
>  I have a dataset called "mp1b".  I have a variable called h.
>   
>  h can take a value from -1 to 5.
>   
>  If h <1, I want to create a new dataset called mp2 that is the same as
mp1b:
>   
>  "mp2<-mp1b"
>   
>  If h > 0, I want to set create a dataset mp2, where I limit the
original dataset to those where mp1b$group = =h. similar to:
>   
>  "mp2<-subset (mp1b, group= = h)"
>   
>  I have tried this ifelse statement, but it does not seem to work as
expected.
>   
>  "mp2<-ifelse(h<1,mp1b,subset(mp1b,cluster_q==h))"
>   
>  Assistance is appreciated.
>
>			
>---------------------------------
>
>
>	[[alternative HTML version deleted]]
>
>  
>
>------------------------------------------------------------------------
>
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-- 
Ferdinand Alimadhi
Programmer / Analyst
Harvard University
The Institute for Quantitative Social Science
(617) 496-0187
falimadhi@latte.harvard.edu
www.iq.harvard.edu


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t c wrote:
> I am using R in a Microsoft Windows environment.
>    
>   I have a dataset called ?mp1b?.  I have a variable called h.
>    
>   h can take a value from -1 to 5.
>    
>   If h <1, I want to create a new dataset called mp2 that is the same as
mp1b:
>    
>   ?mp2<-mp1b?
>    
>   If h > 0, I want to set create a dataset mp2, where I limit the
original dataset to those where mp1b$group = =h. similar to:
>    
>   ?mp2<-subset (mp1b, group= = h)?
>    
>   I have tried this ifelse statement, but it does not seem to work as
expected.
>    
>   ?mp2<-ifelse(h<1,mp1b,subset(mp1b,cluster_q==h))?
mp2 <- if(h<1) mp1b else subset(mp1b,cluster_q==h)

Uwe Ligges

>   Assistance is appreciated.
> 
> 			
> ---------------------------------
> 
> 
> 	[[alternative HTML version deleted]]
> 
> 
> 
> ------------------------------------------------------------------------
> 
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> PLEASE do read the posting guide!
http://www.R-project.org/posting-guide.html