[R-sig-QA] create groups based upon different levels of 4 factors

[Mary A. Marion]

Hello to the R gurus,

My data is bound in a dataframe.
data2<-cbind.data.frame(digrp,gender, agegrp, bmigrp,wt)
data2[1:5,]

I want to create groups based upon different levels of 4 factors
ind<- as.logical ( (digrp=1) & (gender=1) & (agegrp="[20-35)") & 
(bmigrp="[0,18.5)" ) );

Error in (digrp = 1) & (gender = 1) & (agegrp = "[20-35)") :
  operations are possible only for numeric or logical types
 >
I keep getting an error message.  How do I see that the above statement 
is in correct type format?
#operations are possible only for numeric or logical types.   why does 
it not include bmigrp?

Thanks.

Sincerely,
Mary A. Marion