Trying to change range of code for if else statement

I'm trying to use a for // if-else statement to change [i + 1: i + k] if i == 1

for (i in 15:nrow(data)){
if data$ValBin.E == 1 {
data$Hold.Bin.E[(i + 1):(i+hold.pd)] == 0
} else {
data$Hold.Bin.E[(i+1):(i+hold.pd)] <- data$ValBin.E}}

i get unexpected symbol errors and unexpected } errors