[R] Loops and vector operations

[Mago84]

Dear all, 
this is my first post and I´m very new at R, I don´t know if somebody can
help with an issue.
I´m doing some exercices and I don´t know if for example I can convert this
for in an operation with vectors:

for (i in 2:n){
	if (ES[i-1]==0 && sprd[i-1]>mediaSDP[i-1]  && sprd[i]<=mediaSDP[i]) {ES[i]
<- -1} else
	if((ES[i-1]==-1 || ES[i-1]==-15) && sprd[i]>media[i]) {ES[i] <- -15} else
	if((ES[i-1]==-1 || ES[i-1]==-15) && sprd[i]<=media[i]) {ES[i] <- -17} else
	if(ES[i-1]==0 && sprd[i-1]<mediaSDN[i-1] && sprd[i]>=mediaSDN[i])
{ES[i] <- 1} else
	if((ES[i-1]==1 || ES[i-1]==15)&& sprd[i]<media[i]) {ES[i] <- 15} else
	if((ES[i-1]==1 || ES[i-1]==15)&& sprd[i]>=media[i]) {ES[i] <- 17}
else {ES[i] <-0}
}

Thanks a lot!!

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