[R] subset

[Rogerio Rosa da Silva]

Dear all,

I am trying to extract rows from a data.frame based on the
rowSums != 0.  I want to preserve rownames in the first column in the subset.

Does anyone know how to extract all species that don't have rowSums equal
to zero?  Here it is:

# dataset
x <- data.frame(
species=c("sp.1","sp.2","sp.3","sp.4"),
site1=c(2,3,0,0),
site2=c(0,0,0,0),
site3=c(0,1,0,6),
site4=c(0,0,0,0))

#I want extract the matrix:

 species site1 site2 site3 site4
  sp.1     2     0     0     0
  sp.2     3     0     1     0
  sp.4     0     0     6     0

#extract data.frame of rowSums with x[,2:4] != 0 

subset (x, apply (x,1,function(row) all(rowSums(x[,2:4] !=0)) ## don't work


Thanks in advance.

-- 
Rogério R. Silva
MZUSP http://www.mz.usp.br
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