[R] how to speed up this for loop?

[Rheannon]

Could anyone tell me a better way to achieve the output of this for loop? It
seems to run quite slow. I'm sure there must be a more consise way to sum
from FN to LN, excluding positive values, for each row.

#sum between FN and LN, excluding positive values
for(i in 1:R){
for(j in FN[i]:LN[i]){
if(Temp[i,j]<0)
sum[i] <- sum[i] + sum(Temp[i,j])}}

Cheers, 
R
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