Suppose you want to take a list of lines, and filter out just the ones 
where the third field exceeds 100.  This works:

@OutLines = grep { my @f = split / +/, $_; $f[2] > = 100 } @InLines;

My question is, why can I not simplify it, eliminating the temporary @f 
variable, like this:

@OutLines = grep { $@{split / +/, $_}[2] > = 100 } @InLines;

I keep getting this error about "uninitialized value in numeric ge".  If 
I understand correctly, putting @{ } around the split should let me 
group it so I can use the $...[] notation to subscript it.  Apparently I 
misunderstand.

Does anyone know how I can properly write this as an expression, without 
needing the intermediate variable?

Thanks,
Lyle Kopnicky
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