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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