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Re: [Gcl-devel] RE: [Maxima] modulus


From: Camm Maguire
Subject: Re: [Gcl-devel] RE: [Maxima] modulus
Date: 02 Dec 2003 14:40:58 -0500
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.2

Greetings!

"Stavros Macrakis" <address@hidden> writes:

> > > In a fresh GCL 2.5.0, (expt 234 234234) immediately crashes with an 
> > > illegal instruction (0xc000001d) at location 0x0053f611.
> 
> > 1) Please try with latest gcl for windows, at
> > http://www.cs.utexas.edu/users/boyer/gcl
> 
> I tried, but file not found:
> /users/~boyer/gcl/stable-binary/gcl_2.6.1.mingw32_japi_xdr_20031026.zip
> 

OK this should be fixed now -- thanks!

> >    hangs for a very long time trying to calculate the answer.
> >    I cannot tell if this is a problem, or whether the number is
> >    effectively too large to be processed in a reasonable amount
> >    of time.
> 
> Well, in Maxima (gcl 2.5.0) it returns in 1.2 secs (1Ghz Athlon), though
> displaying it takes far longer than that.  The first 100 digits agree
> with bfloat, (234.0b0^234234, fpprec:100) and the last 30 agree with
> modular exponentiation (rat(234)^234234,modulus:10^34), and a couple of
> other cross-checks also agree, so I'm convinced it is giving the correct
> result.
> 

Perhaps these maxima calls do not invoke (expt 234 234234)?  Is there
another algorithm/implementation maxima provides natively?

Take care,

>         -s
> 
> Maxima 5.9.0 gcl 2.5.0 W2k mingw32 Athlon 1Ghz
> 
> 
> 
> 

-- 
Camm Maguire                                            address@hidden
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"The earth is but one country, and mankind its citizens."  --  Baha'u'llah




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