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.
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## 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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