[Banking-pm] What CPAN modules do you use?

[mike at wormers.net]

Why use classes like BigFloat etc? Does it suggests a level
of accuracy beyond the model? i.e. 'double' should be sufficient? The
extra 'precision' probably isn't getting you a more accurate figure (does
depend on what exactly you are computing though I suppose).



>
> On 22 Aug 2007, at 18:39, Adriano Ferreira wrote:
>
>> On 8/22/07, Mark Blackman <mark at blackmans.org> wrote:
>>>
>>> On 22 Aug 2007, at 10:56, Billy Abbott wrote:
>>>>
>>>> Things like the ISIN module were what I was referring to - things
>>>> which
>>>> are more finance specific. There are a bunch of industry specific
>>>> things
>>>> up on CPAN for many different industries, I was just wondering if
>>>> there
>>>> are any that cater to our side of things that people actually use.
>>>
>>> Anyone using Math::BigInt or Math::BigFloat to deal with accumulation
>>> of FP errors in computations?
>>>
>>> As illustrated by the trivial example of
>>>
>>> perl -e 'print "accumulation error!\n" if (0.25+0.33 != 0.58)';
>>
>> If you're prepared for the hit performance, then:
>>
>> $ perl -Mbignum -e 'print "ok!\n" if (0.25+0.33 == 0.58)';
>> ok!
>>
>> works wonderfully. And don't forget these modules received a lot of
>> attention recently. Many changes were introduced for the future 5.10
>> perl release and are available already in the CPAN distributions.
>
> Well, as bignum is just the transparent version of Math::BigFloat/
> BigInt,
> in a roundabout way, I'm asking does anyone on the list ever have a
> requirement
> to avoid these accumulation errors and is the requirement
> sufficiently hard
> that they are obliged to live with the performance hit to use
> Math::BigFloat?
>
> Do you use it for production work?
>
> Regards,
> Mark
>
>>
>>>
>>> - Mark
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>
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