TRandom::Rndm is a _direct_ one-to-one translation into C++
of CERNLIB's RNDM. The call parameter is dummy, it has never
been used by FORTRAN as well. It was necesary for purely technical
reasons: some old FORTRAN compilers didn't allow to write a function
without parameters.
-best, Pasha.
KOSU_FOKIN@garbo.lucas.lu.se wrote:
>
> Could you tell me what Int_t argument is for in Rndm :
>
> Float_t TRandom::Rndm(Int_t)
> {
> // Machine independent random number generator.
> // Produces uniformly-distributed floating points between 0 and 1.
> // Identical sequence on all machines of >= 32 bits.
> // Periodicity = 10**8
> // Universal version (Fred james 1985).
>
> const Float_t kCONS = 4.6566128730774E-10;
> const Int_t kMASK31 = 2147483647;
>
> fSeed *= 69069;
> // keep only lower 31 bits
> fSeed &= kMASK31;
> // Set lower 8 bits to zero to assure exact float
> Int_t jy = (fSeed/256)*256;
> Float_t random = kCONS*jy;
> return random;
> }
>
> best,
> Anton
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