I was testing the speed of vector creation, and I was surprised to see that for/vector seems much slower than using 'for' with an explicit vector-set!
(printf "let's try just generating a big vector.\n")
(rtavg (for/vector ([i (in-range (* 100 sr))]) 0.243))
(printf "\n\n")
(printf "how about with explicit vector-set! ?\n")
(rtavg
(let ([v (make-vector (* 100 sr))])
(for ([i (in-range (vector-length v))])
(vector-set! v i 0.243))))
(printf "\n\n")
==>
let's try just generating a big vector.
2.218 seconds
how about with explicit vector-set! ?
0.089 seconds
Does the first one somehow have to check some things that the second one
doesn't?
John
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