R help - Nov 2009 - any equivalent SUM IF statement in R

for example, i want to sum all the row entries if column 1 takes the value
"boy". anyone knows ?
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Presumably you want all the columns _except_ column 1, right?

Perhaps (no code, no test) :

sum( dta[ dta[,1]=="boy , -1 ] )

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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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> View this message in context:
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> Sent from the R help mailing list archive at Nabble.com.
>
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David Winsemius, MD
Heritage Laboratories
West Hartford, CT

On 22/11/2009 3:44 PM, ychu066 wrote:
> for example, i want to sum all the row entries if column 1 takes the value
> "boy". anyone knows ?
Subset then sum:

sum(M[M[,1] == "boy", ])

Duncan Murdoch