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2011 Apr 08
1
R and lazy evaluation
Haskell is the prototypical lazy evaluation language. One can compute a
Fibonacci sequence by the Haaskell equivalent of the following R code.
> fibs <- c(0, 1, rep(0, 8))
> fibs[3:10] <- fibs + fibs[-1]
This works as follows.
fibs = 0, 1, 0, 0, 0, 0, 0, 0, 0, 0
fibs = 0, 1, 0, 0, 0, 0, 0, 0, 0, 0
When one adds fibs to fibs[-1], one is effectively adding diagonally:
fibs[3] <-