[haiku-commits] Re: haiku: hrev46684 - src/apps/deskcalc

  • From: John Scipione <jscipione@xxxxxxxxx>
  • To: "haiku-commits@xxxxxxxxxxxxx" <haiku-commits@xxxxxxxxxxxxx>
  • Date: Thu, 16 Jan 2014 10:23:07 -0500

On Thursday, January 16, 2014, Ingo Weinhold <ingo_weinhold@xxxxxx> wrote:

> On 01/16/2014 01:16 PM, John Scipione wrote:
>> On Thursday, January 16, 2014, Ingo Weinhold <ingo_weinhold@xxxxxx
>> <mailto:ingo_weinhold@xxxxxx>> wrote:
>>     On 01/16/2014 01:01 AM, jscipione@xxxxxxxxx wrote:
>>         969fac1: Evaluate asynchronously in a separate thread
>>             Show calculating animation
>>     I'm surprised to learn that DeskCalc supports an operation that
>>     takes long enough. Which is it? Or do you nest a few million sin()
>>     or something like that?
>> ! (Factorial)
> I see. How about using an exact computation up to say n=1000 and beyond
> that use a good approximation [1]? It doesn't seem particularly useful to
> wait 10 minutes for an exact 1000000! result when in the end only a few
> significant digits are shown anyway

How convinient, a solution that doesn't invole managing multiple threads of

I like it!

Seems like it could speed up factorials tremendoulsy. I already throw out
everything after 40 significant digits or so anyway because it takes too
long to parse.

I'm no mathematician though, I only know the basics of multi-variable
calculus and differential equations so I can't say that there aren't other
long running operations available that might need this.

The overhead of running the calculation in a separate thread is small. I
did this mostly as an exercise to learn about how threading works on Haiku.

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