Re: [Maxima-discuss] e, pi, gamma, log(2)

[Volker v. N. <vol...@gm...>]

Am 22.09.2014 21:40, schrieb Raymond Toy:
>>>>>> "Volker" == Volker van Nek <vol...@gm...> writes:
> 
>     Volker> Am 22.09.2014 18:27, schrieb Raymond Toy:
>     >> 
>     Volker> fpprec:30$
>     Volker> x:0.5b0$
>     Volker> asin(x);            --> 5.23598775598298873077107230547b−1
>     Volker> bs_asin(x);         --> 5.23598775598298873077107230547b−1
>     Volker> sin(asin(x));       --> 5.00000000000000000000000000001b−1
>     Volker> bs_sin(bs_asin(x)); --> 5.00000000000000000023968760547b−1
>     >> 
>     >> Interesting. I'm sure this can be fixed, but it seems like an odd
>     >> artifact.
>     >> 
> 
>     Volker> I fixed it. Now it seems that the bs_ functions are more accurate.
> 
> What was the fix? (Did you ever post the code? I can't seem to find
> it.)
> 

Not worth mentioning. Most of the code I have written during spring and
I had forgotten a lot during summer. While fixing one thing I messed up
another.

I will commit the code tomorrow. Too late for me now.


> 
> I would look at what bigfloatp does in the case where fpprec is lower
> than the actual precision of the bigfloat. It adds the value of *m
> into the exponent.

Yeah! bigfloatp does it. Now I understand the mechanism.

Ray, thanks a lot.

Volker


> 
> Ray
> 
> 
> ------------------------------------------------------------------------------
> Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
> Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
> Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
> Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
> http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
> _______________________________________________
> Maxima-discuss mailing list
> Max...@li...
> https://lists.sourceforge.net/lists/listinfo/maxima-discuss
>