not my best coding ever but....
BASIC Code wrote:
:°
A
:"
Str1
:For(X,1,8
:If 2fPart(iPart(A/(2^(X-1)))/2
:Then
:"1"+Str1
Str1
:Else
:"0"+Str1
Str1
:End
:End
:sub(Str1,1,8
Str1
:Lbl 9
:"Input NEXT RAND? (Y/N),Str2
:"If Str2=Y
:1
A
:"If Str2=N
:"0A
:"If Str2
Y and Str2
N
:"Goto 9
:If A
:Then
:sub(Str1,2,7)+sub(Str1,1,1
Str1
:128("1"=sub(Str1,1,1))+64("1"=sub(Str1,2,1))+32("1"=sub(Str1,3,1))+16("1"=sub(Str1,4,1))+8("1"=sub(Str1,5,1))+4("1"=sub(Str1,6,1))+2("1"=sub(Str1,7,1))+("1"=sub(Str1,8,1
:3Ans+1
X
:Disp X/767
:"
Str1
:For(B,1,8
:If 2fPart(iPart(X/(2^(B-1)))/2
:Then
:"1"+Str1
Str1
:Else
:"0"+Str1
Str1
:End
:End
:sub(Str1,1,8
Str1
:End
:If A
:
Generated by
SourceCoder, © 2005
Cemetech
This line:
Code: :Lbl 9
:"Input NEXT RAND? (Y/N),Str2
:"If Str2=Y
:1A
:"If Str2=N
:"0A
:"If Str2=/=Y and Str2=/=N
:"Goto 9
Can be optimized:
Code:
:0->A "Or Delvar A
:Repeat Ans=92 or Ans=71
:getkey
:End
:(Ans=92)->A
Also why did you have the quotation marks before the code on some lines?
whooppsss...forgot to remove some comments....
elfprince13 wrote:
whooppsss...forgot to remove some comments....
So those lines weren't supposed to be in the program?
something1990 wrote:
So those lines weren't supposed to be in the program?
correct
they used to be part of the program..then I decided they were too annoying and that ON would serve nicely to quit.
something1990 wrote:
This line:
Code: :Lbl 9
:"Input NEXT RAND? (Y/N),Str2
:"If Str2=Y
:1A
:"If Str2=N
:"0A
:"If Str2=/=Y and Str2=/=N
:"Goto 9
Can be optimized:
Code:
:0->A "Or Delvar A
:Repeat Ans=92 or Ans=71
:getkey
:End
:(Ans=92)->A
Also why did you have the quotation marks before the code on some lines?
it bit shifts a 1 byte string then multiplies by 3 and adds 1.
then I display the result divided by 767 (aka 11111111 * 00000011 + 00000001 + 00000001), to get it as decimal.
Wait, what? Where do these strings come from? Is this a pseudorandom number generator, or what?
jpez wrote:
Is this a pseudorandom number generator
EVERY random number generator is pseudorandom. Even a 'random number' you pick in your head will be pseudorandom, its impossible to get a truly random number
A pseudorandom number generator starts from a seed and uses a deterministic algorithm to generate the next number in the sequence. I couldn't tell whether his algorithm generates a sequence of numbers from a user-given seed or if it just alters a number given by the user in a "random" way.
jpez wrote:
A pseudorandom number generator starts from a seed and uses a deterministic algorithm to generate the next number in the sequence. I couldn't tell whether his algorithm generates a sequence of numbers from a user-given seed or if it just alters a number given by the user in a "random" way.
i knew what you meant, i was just pointing out the technicality that every 'random' number proggy is pseudorandom 
The only truly random number generator is something like taking the value of a pixel from a camera watching something like a lava lamp.
It starts out using startTmr (easily changed to allow seeding).
Then it converts between a Real variable and a binary string that only uses the low-order byte of the variable.
You have to explain these things in plain english. Just because we know TI-BASIC does not mean we instantly understand the context of your technical jargon.
@Kerm: I believe some random number generators use background static.
elfprince13 wrote:
It starts out using startTmr (easily changed to allow seeding).
Then it converts between a Real variable and a binary string that only uses the low-order byte of the variable.
That makes sense. So it seeds the generator with a timer value, turns it into a regular number, takes the bottom 8 bits of that number if it were represented in binary, and turns that into a string. Eh?
@Jpez: that would work too.
KermMartian wrote:
The only truly random number generator is something like taking the value of a pixel from a camera watching something like a lava lamp.
its still arguably not truly random. Better than most generators? yes. Truly random? not so much
It's an interesting proof-of-concept though to show a fairly good random number generator can be created in pure BASIC.
it uses essentially the same type of formula used by the TI-OS and the random functions in most programming languages. the formula may be more or less complicated, but the technique is the same.
Oh really? Interesting. Once I found some documentation on how the TI-OS rand( function works, but I don't remember where that was. :/
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