[R] How to get rid of loop?

[Ken-JP]

set.seed(1)
x <- runif(100)

# I want to calculate y such that:
#
# 1. if x>0.75, y <- 1
# 2. else if x<0.25, y <- -1
# 3. else if y_prev==1 && x<0.5, y <- 0
# 4. else if y_prev==-1 && x>0.5, y <- 0
# 5. else y <- y_prev
#
# 1. and 2. are directly doable without looping.
#
# How do I do 3.-5. without looping?  The problem is, I need to run this
algorithm over gigs of data, so I
# need to avoid looping, if at all possible...
#
# - Ken



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