Some assembler alternative to very much scientific algos to get float random number in given range :eusa_boohoo:
Hi Adamanteus,
Try to combine your random number generator with Windows' system timer. On every execution of your application, you will get a different list of numbers.
Here is a version that is compatible with a standard Masm32 installation, i.e. no environment variables required. I haven't changed anything substantial.
As to the quality of the generated numbers: you are using nrandom, which afaik has been tested a lot in the old forum, e.g. here (http://www.movsd.com/board/index.php?topic=11679.msg122831#msg122831).
Quote from: Vortex on July 05, 2012, 05:33:18 AM
Try to combine your random number generator with Windows' system timer. On every execution of your application, you will get a different list of numbers.
Algorithm done for built-in whole numbers random generator, it could be crt_rand, nrandom and all others, and random seed for it is need to add by hand – crt_srnad or unknown eax value and all others ::)
Here is a quick crt_rand example :
include \masm32\include\masm32rt.inc
.data
f1 db 'Number %d = %d',13,10,0
.code
start:
call main
invoke ExitProcess,0
main PROC uses esi ebx
LOCAL _st:SYSTEMTIME
invoke GetSystemTime,ADDR _st
movzx ebx,SYSTEMTIME.wMilliseconds[_st]
@@:
invoke crt_rand
dec ebx
jnz @b
mov esi,100
mov ebx,10
@@:
invoke crt_rand
xor edx,edx
div esi
invoke crt_printf,ADDR f1,ebx,edx
dec ebx
jnz @b
ret
main ENDP
END start
One potential problem with the CRT rand function is the 15-bit range.
As a test I decided to do a scatter plot of the randf_size return values. The plot showed no problems, but to make it work I had to modify randf_size.asm.
Hi MichaelW,
Nice example. You should modify the batch file makeit.bat to build the application as GUI.
Hi Vortex,
I left it as a console app so that by uncommenting the printf, Sleep, and FLD ST statements it would be easy to see what is wrong.
Hi all,
After reading this topic, i have prepared my own random real number generator. Not perfect but gives an idea.
Also i edited your sample codes as a radasm project, i attached them
Finally, i wanna share your randf.asm and sample codes on my website, if it is not problem for you, @MichaelW, @Adamanteus ??
From me it's absolute :biggrin: freeware - do anything you want, except patent as invention of you own.
Aha thanks a lot i have been waiting for this comment :t i will publish these on my blog :greensml: