Presumably you want all the columns _except_ column 1, right?
Perhaps (no code, no test) :
sum( dta[ dta[,1]=="boy , -1 ] )
--
David.
On Nov 22, 2009, at 3:44 PM, ychu066 wrote:
for example, i want to sum all the row entries if column 1 takes the
value
"boy". anyone knows ?
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