Fibonacci vector in R

Builds the sequence into a preallocated vector rather than growing one.

fibonacci <- function(n) {
  fib <- numeric(n)
  fib[1:2] <- c(0, 1)
  for (i in 3:n) {
    fib[i] <- fib[i - 1] + fib[i - 2]
  }
  fib
}

Keywords and builtins used here

• c
• for
• function
• in
• numeric

The run, in numbers

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At the three-star pace of 85 tokens a minute, this run takes about 40 seconds.

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Step 5 of 5 in Flow & functions, step 9 of 20 in Language basics.

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