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Re: 3DLDF


From: Hans Aberg
Subject: Re: 3DLDF
Date: Wed, 18 Aug 2004 00:29:41 +0200

At 16:28 +0100 2004/08/17, Frank Heckenbach wrote:
>> At 01:52 +0100 2004/08/16, Frank Heckenbach wrote:
>> >> At 16:53 +0100 2004/08/15, Frank Heckenbach wrote:
>> >> >GMP implements floating point numbers with statically unbounded (but
>> >> >finite) number of binary digits (mpf),
>> >>
>> >> Actually the precision allocation is dynamic (check the definition of
>> >> mpf_t).
>> >
>> >I know. That's why I said it's statically unbounded (dynamically
>> >it's only bounded by available (addressable) memory, AFAIK).
>>
>> Statically unbounded implies that the choice is made at compile time (as
>> for example in C++ template class Float<n>), but in reality, the choice is
>> fully dynamic (as in C++ constructor class Float(n)).
>
>I'd have called the former statically bounded (since you determine
>the bound at compile time, i.e. statically), but let's not get into
>another discussion about that. We know what's meant.

It looks as though you think that in GMP, floating point precision is set
statically, but it is set dynamically. It is dynamically unbounded, not
merely statically unbounded, as the bound can be changed at runtime.

  Hans Aberg






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