Re: Sv: Sv: A83: Random values
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Re: Sv: Sv: A83: Random values
Just use the contents of register r, only for the random seed though.
Otherwise a pattern could develop.
Joe Wingbermuehle
http://www.usmo.com/~joewing/
-----Original Message-----
From: Thomas Turn Jensen <Mukke@get2net.dk>
To: assembly-83@lists.ticalc.org <assembly-83@lists.ticalc.org>
Date: Friday, September 11, 1998 1:50 PM
Subject: Sv: Sv: Sv: A83: Random values
>
>Ah.... That last thing sounds interesting...
>the writing back thing is kinda tricky.. Wouldn't know how to do that yet -
and any explanation ppl could get me would still be too technical I'm
afraid... but just wait.. maybe next week I'll ask....
>
>Thanks again for the great delay measuring trick.
>
>-----Oprindelig meddelelse-----
>Fra: Linus Akesson <lairfight@softhome.net>
>Til: Thomas Turn Jensen <assembly-83@lists.ticalc.org>
>Dato: 11. september 1998 20:45
>Emne: Re: Sv: Sv: A83: Random values
>
>
>>
>>Yupp. So you can do a writeback to the program, saving the last random
number
>>and reading it back as the first random number when the program is run
again.
>>Another widely used method is to check how long time the user waits before
>>pressing a key. This would involve using your own key loop, instead of
>>_getkey:ing.
>>
>>Linus
>>
>>On 11-Sep-98, Thomas Turn Jensen wrote:
>>
>>>But if I start with a constant - wouldn't my program just come up with
the
>>>same random numbers everytime it is run?
>>
>>>This may be a stupid question, but I simply doesn't follow you.. Care to
>>>explain more (plz :-)?
>>
>>>-----Oprindelig meddelelse-----
>>>Fra: Linus Akesson <lairfight@softhome.net>
>>>Til: Thomas Turn Jensen <assembly-83@lists.ticalc.org>
>>>Dato: 11. september 1998 18:30
>>>Emne: Re: Sv: A83: Random values
>>
>>
>>>>
>>>>You don't. Use a constant, or the contents of some register at program
start
>>>>or whatever. The random routines in the os always start with the same
>>number,
>>>>I think it is 0.94 or something the first time you use math->rand with
new
>>>>batteries.
>>>>
>>>>Linus
>>>>
>>>>On 10-Sep-98, Thomas Turn Jensen wrote:
>>>>
>>>>>Great!....
>>>>>..ehm.. How do I get that Starting random # ?
>>>>
>>>>>-----Oprindelig meddelelse-----
>>>>>Fra: Linus Akesson <lairfight@softhome.net>
>>>>>Til: Thomas Turn Jensen <assembly-83@lists.ticalc.org>
>>>>>Dato: 10. september 1998 21:02
>>>>>Emne: Re: A83: Random values
>>>>
>>>>
>>>>>>
>>>>>>Random algorithms are quite numerous out there... one idea is to take
the
>>>>>>previous random number you got, rotate it some, add some, eor some,
then
>>>try
>>>>>>the program and see if there's a visible pattern. If there is, change
some
>>>>of
>>>>>>the constants and try again...
>>>>>>
>>>>>>Linus
>>>>>>
>>>>>>On 10-Sep-98, Thomas Turn Jensen wrote:
>>>>>>>I need to get two random values...
>>>>>>>one in the range [0..94] and the other in [1..64] (yes you guesed
it -
>>>it's
>>>>>>>for the graph-screen)
>>>>>>
>>>>>>>I've found a function called "_Random" but have no idea what
parameters
>>it
>>>>>>>takes where - nor what/where the output is...
>>>>>>
>>>>>>>Could someone either explain to me how it works or tell me how to
write
>>>>>>>something which results in the above mentined numbers. (If i get a
>>>function
>>>>>>>that results in a random byte thats ok - where I need it, speed isn't
>>>>>>>essential so I can just check it and if not good generate another
random
>>>>>>>number)
>>>>>>>In case someone gives me some code, _plz_ explain what it does as I'm
>>more
>>>>>>>interesting in learning how to make it rather than always use other
>>>peoples
>>>>>>>code.
>>>>>>
>>>>>>>Thank you.
>>>>>>
>>>>>>>***
>>>>>>>Thomas Turn Jensen
>>>>>>>Icq uin => 8128636
>>>>>>>IRC, Undernet => Mukke
>>>>>>>***
>>>>>>>If your computer gives you trouble
>>>>>>>Call for Mukke on the double
>>>>>>>***
>>>>>>
>>>>>>
>>>>
>>>>
>>>>
>>>>
>>
>>
>>
>>
>