chickadee » vector-lib » vector-unfold

vector-unfold f length initial-seed ···procedure

The fundamental vector constructor. Creates a vector whose length is length and iterates across each index k between 0 and length, applying f at each iteration to the current index and current seeds, in that order, to receive n + 1 values: first, the element to put in the kth slot of the new vector and n new seeds for the next iteration. It is an error for the number of seeds to vary between iterations.


(vector-unfold (λ (i x) (values x (- x 1)))
               10 0)
  ;=> #(0 -1 -2 -3 -4 -5 -6 -7 -8 -9)

Construct a vector of the sequence of integers in the range [0,n).

(vector-unfold values n)
  ;=> #(0 1 2 ··· n-2 n-1)

Copy vector.

(vector-unfold (λ (i) (vector-ref vector i))
               (vector-length vector))