Random number function (NEEDED)

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3 total messages Started by Bryon S. Lape Sun, 24 Jan 1993 22:41

#7718

Author: Bryon S. Lape
Date: Sun, 24 Jan 1993 22:41

11 lines
922 bytes

	I need a random number generating function.  I cannot use rand()
and srand().  I am developing a Random class for c++.  Please e-mail me
with ansers or pointers.


Bryon Lape
-- 
------------------------------------------------------------------------------
              "If you know how much money you will make this year
                 within $5,000, you're broke!"  - Dave Sevren
------------------------------------------------------------------------------

Re: Random number function (NEEDED)

#7746

Author: Michael Spencer
Date: Mon, 25 Jan 1993 19:54

16 lines
1026 bytes

lape@cs.utk.edu (Bryon S. Lape) writes:

>	I need a random number generating function.  I cannot use rand()
>and srand().  I am developing a Random class for c++.  Please e-mail me
>with ansers or pointers.

Why can't you use rand() & srand()?  
Your answer may determine what can be done.

-- 

===========================================================================
Michael Spencer            |      2640 Borregas
spencer@cats.ucsc.edu      |      Aptos, CA   95003
===========================================================================

Re: Random number function (SUPPLIED)

#7756

Author: Bittware
Date: Tue, 26 Jan 1993 02:11

33 lines
1190 bytes

I coded this up from an article I think in EDN, by an engineer at 
Tektronix.  The code in the article was in some DSP assembler, and I
converted it to C (isn't that backwards??).  Anyway, it works.  I tested
it on a DSP32c output to a D/A and to a spectrum analyzer.

-----BEGIN RAN32.C-----

#include <math.h>

/* generate 32-bit random noise using DSP32c */

void ran32 (ioval)
unsigned long *ioval;
{

#define  C    0x234567
#define  Alo  0x007465
#define  Ahi  0x000010

  unsigned long Rlo, Rhi;
  unsigned long ar1, ar2, ar3;
  unsigned long t1, t2, t3;

  Rlo = *ioval & 0x00ffff;
  Rhi = *ioval >> 16;
  ar1 = Alo * Rlo;
  ar2 = Alo * Rhi;
  ar3 = Ahi * Rlo;
  t1 = (ar2 + ar3);
  t2 = t1 << 16;
  t3 = ar1 + t2;
  *ioval = C + t3;
}

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