On 9/29/23 02:18, Jeronimo Pellegrini wrote:
On 2023-09-28 20:56, Zelphir Kaltstahl wrote:
I am trying to deterministically generate random floats using SRFI-27 and I
stumbled upon something weird:
~~~~
(use-modules (srfi srfi-27))
(define random-source (make-random-source))
(define random-state (random-source-pseudo-randomize! random-source 0 12345))
(define random-float-gen (random-source-make-reals random-state))
random-source-make-reals does not accept a random-state, but a random-source
(which has an internal random-state, which you already randomized with
random-source-pseudo-randomize!)
That's why Guile is complaining about a wrong type of argument -- a
random-state struct was passed, but a random-source was expected.
(By the way, my interpretation of the SRFI is that
random-source-pseudo-randomize! changes the
internal state of the source passed to it, and it doesn't even need to return
anything - Guile
seems to do it as a convenience)
I do not understand, what I am doing wrong, since the same seems to work for
integers:
I do (see below). :)
~~~~
(use-modules (srfi srfi-27))
(define random-source (make-random-source))
(define random-state (random-source-pseudo-randomize! random-source 0 12345))
(define random-integer-gen (random-source-make-integers random-source))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
It works because you got it right this time (random-source, not random-state).
What do I need to do, to get a deterministic generator like I have for integers?
(define random-float-gen (random-source-make-reals random-source)) ;; <-
source, not state
Does that fix it?
J.
Ah, thank you Jeronimo!
I was under the impression that random-source-make-reals wants the random state
>.<
This apparently work, thank you!
Regards,
Zelphir
--
repositories: https://notabug.org/ZelphirKaltstahl
