RANDOM GENERATOR

[artrag]

Hi, is it possible in INTYBASIC to set a seed in the random number generator?

I would like to generate a repeatable sequence of random numbers, but  RND and RANDOM seem to have no initialization 

 

[intvnut]

I'm pretty sure the IntyBASIC random number generator isn't meant to be repeatable.  It has a _next_random function that gets called in the interrupt service routine to advance the random generator.

 

If you want a repeatable, replayable random number generator that runs from solely a seed and produces the exact same random numbers every time from that seed, you'll have to code one directly, I think.

 

LFSRs are cheap both in execution time and storage.  If you have some RAM to spare, a lagged-Fibonacci generator is also cheap, but requires RAM for the state.  And, of course, you need to expand the seed to initialize the lagged-Fibonacci history buffer.

 

I'm guessing you don't want the xkcd approach:

 

And then there's the Doom approach.

 

Edited December 7, 2019 by intvnut
clarification

[artrag]

I love the doom approach...

[+Lathe26]

Technically, the XKCD approach is the same as the Doom approach but the table only has 1 element.  Just saying...

[intvnut]

2 hours ago, Lathe26 said:

Technically, the XKCD approach is the same as the Doom approach but the table only has 1 element.  Just saying...