Re: picking a new random seed

On Jan 27, 9:33 pm, "Curtis A. Jones" <curtis_jo...@[EMAIL PROTECTED]
> wrote:
> Charles,
> Simply constructing an integer from the system clock to use as the
> seed {quadRL} for the random number generator may give a less than
> ideal sequence.
>
> James J. Weinkam discusses this in this comp.lang.apl group under
> "Random Number Generation in IP Sharp APL" (29 Jun 2006
1917)http://groups=
..google.com/group/comp.lang.apl/browse_frm/thread/33c60d...
>
> Among the consequences of a poor choice of seed:
> "Moreover choosing a seed which is nor relatively prime to the modulus
> causes the generator to produce a subsequence which is not of maximum
> length."
>
> One recommendation he makes:
> "...saving the value of the seed at the end or each run and using that
> value to seed the generator at the start of the next run."
>
> I imagine you know this and have a function that selects only "valid
> values for {quadRL}" from the clock.  Would you share it?
>
> My crude approach is to simply list {quadRL} after every permutation I
> generate (often for assigning students to groups in labs).  Next time
> I go back to the listing in the session log to start from there.
> Curtis

Why not combine the random element of the clock with advancing =E2=8E=95RL
b=
y
running
z=E2=86=90?(0=E2=8A=A5=E2=8E=95TS)=E2=8D=B41 =E2=8D=9D z gets query (zero
de=
code quad TS)reshape one
That way, even if you never save the ws with a different =E2=8E=95RL you
at
least get a random selection of the present and the next 999.

Phil