[R] apply question

Giovanni Azua bravegag at gmail.com
Fri Apr 30 23:11:54 CEST 2010

Hello David,

On Apr 30, 2010, at 11:00 PM, David Winsemius wrote:
> Note: Loops may be just as fast or faster than apply calls.
How come!? is this true also for other similar functions: lapply, tapply and sapply?

Then the only advantage of these above is only syntactic sugar? 

>> indices <- replicate(B,sample(1:N, size=N, replace=TRUE))
>> theta_star <- apply(indices,2,statistic,data)
> Why not:
> theta_star <- apply(indices,2, function(x) statistic(data, x) )
> May end up as a data class that needs further work, depending on what "statistic" return.
Nice! thank you!

Best regards,

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