Hi:
Could you please provide a reproducible example? In your code,
(i) n is undefined;
(ii) logbp is undefined.
A description of what you want to do and/or a reproducible example
with an expected outcome would be useful.
As the bottom of each e-mail to R-help says...
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
Dennis
On Tue, Aug 2, 2011 at 4:05 AM, Kathie <kathryn.lord2000 at gmail.com>
wrote:> Dear R users,
>
> Would you plz tell me how to avoid this "for" loop blow??
>
> I think there might be a better way to reduce running time.
>
>
----------------------------------------------------------------------------------------------
> ## y1 and y2 are n*1 vectors
>
> ? ? ? ?for (k in 1:n){
> ? ? ? ? ? ? ? ?ymax <- max( y1[k], y2[k] )
>
> ? ? ? ? ? ? ? ?i <- 0:ymax
>
> ? ? ? ? ? ? ? ?sums<- -lgamma(y1[k]-i+1)-lgamma(i+1)-lgamma(y2[k]-i+1)
>
> ? ? ? ? ? ? ? ?maxsums <- max(sums)
>
> ? ? ? ? ? ? ? ?sums <- sums - maxsums
>
> ? ? ? ? ? ? ? ?lsum <- log( sum(exp(sums)) ) + maxsums
>
> ? ? ? ? ? ? ? ?logbp[k] <- y1[k] ?+ y2[k] ?+ lsum
> ? ? ? ?}
>
>
------------------------------------------------------------------------------------
>
> Any suggestion will be greatly appreciated.
>
> Regards,
>
> Kathryn Lord
>
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>
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>