Random number generator.

Swordfish · 31 Dec 2011 at 15:01

I posted this initially in the Windows sfotware section but might hve better joy here

Does anyone know of a random generator that I can use that will be able to remember each number generated and not generate it again.

http://forums.overclockers.co.uk/showthread.php?t=18357826

What I need it to do is to generate a number between 1 and ,say, 128 and report that number and then select a new number but the generator knows not to pick the first number reported and so on until all numbers are used.

It is to be used for a random draw for a large pool tournament that I'm controlling.

Cheers.

peterwalkley · 31 Dec 2011 at 15:18

This should do it: http://www.random.org/sequences/

Dj_Jestar · 31 Dec 2011 at 15:30

128 balls in a hat/bag/bucket? :E

Swordfish · 31 Dec 2011 at 16:48

Dj_Jestar said:
128 balls in a hat/bag/bucket? :E

If I had 128 balls and a big bucket I woudl do it that way

peterwalkley said:
This should do it: http://www.random.org/sequences/

Been there but need something offline tbh.

Cheers

nippynoo · 31 Dec 2011 at 17:11

http://en.wikipedia.org/wiki/Pseudorandom_binary_sequence

It is 'pseudo' because it is deterministic and after N elements it starts to repeat itself, which may be what you want.

Swordfish · 31 Dec 2011 at 17:15

nippynoo said:
http://en.wikipedia.org/wiki/Pseudorandom_binary_sequence

It is 'pseudo' because it is deterministic and after N elements it starts to repeat itself, which may be what you want.

I'm trying to find something that runs offline that I can give it two sets of numbers and then it will select a random number between the to set and when asked will give another without repeating previous numbers.

tntcoder · 31 Dec 2011 at 17:19

Swordfish said:
I'm trying to find something that runs offline that I can give it to sets of numbers and then it will select a random number between the to set and when asked will give another without repeating previous numbers.

You could do that in excel pretty easily.

Swordfish · 31 Dec 2011 at 17:47

tntcoder said:
You could do that in excel pretty easily.

Can you enlighten me please.

nippynoo · 31 Dec 2011 at 18:46

Swordfish said:
I'm trying to find something that runs offline that I can give it two sets of numbers and then it will select a random number between the to set and when asked will give another without repeating previous numbers.

Yes a PRBS is what you need. Just google it.

Easy to implement in C, with >> shift operator and &.

nippynoo · 31 Dec 2011 at 18:51

example here

http://www.google.co.uk/url?sa=t&rc...8R1o0wtEOYvN-RiyQ&sig2=G5BUvfNC9gvwj1tRNzahLQ

Swordfish · 31 Dec 2011 at 21:51

Cheers for replies. Had a thread about it in Windows software and got a solution there.

http://forums.overclockers.co.uk/showthread.php?t=18357826

Cheers again,