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Re: Problems with BESSELJ
by Eike Rathke
::
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Hi Regina,
On Tuesday, 2009-06-30 23:34:27 +0200, Regina Henschel wrote:
> Excel rounds down to integer. The comment in ODF spec 16.15.11 says that
> Gnumeric allow fractional N, but my Gnumeric 1.6.3 rounds down too. In
> the comment Kspread is said to allow fractional N, but I haven't got
> that program.
Just tried with KSpread 2.0rc1, it returns an error for fractional N.
>> What is "large" and what is "long lasting"?
>
> I would have to implement it in C++ to see how long it really lasts. The
> Basic macro lasts several seconds for x>10000. The effort is linear in x.
Basic of course is some orders of magnitude slower than C++.
> You are right to remember me to Boost, I have overlooked it. I had a
> look at Boost now. The Bessel functions (and a lot of others) are
> included in library "Math Toolkit" since version 1.35.0. I see version
> 1.34.0 in OOo. There is a description in
> http://www.boost.org/doc/libs/1_35_0/libs/math/doc/sf_and_dist/html/math_toolkit/special/bessel/bessel.html.
>
>
>
> Having an actual version of the Boost library would solve a lot of other
> accuracy problems too. I would prefer upgrading Boost library.Seems really the best option.
> When can the upgrade be done?
Don't know. I don't have time for it until OOo3.2, I'll try to ping
Thorsten to see if he's willing, he already did the upgrade to 1.34;
I just know he'll be on vaction soon, so it would take its time anyway.
> Nevertheless, I can provide a patch with the Deuflhard algorithm likely
> in time for OOo3.2 when give me a "go".
Yes, of course, that would be nice.
> BTW, I still need a decision on the UI name of the left tailed
> F-distribution to finish that work. I have FDISTL in mind.
Ah, I thought we already agreed on that, yes, I think FDISTL is fine.
Thanks
Eike
--
OOo/SO Calc core developer. Number formatter stricken i18n transpositionizer.
SunSign 0x87F8D412 : 2F58 5236 DB02 F335 8304 7D6C 65C9 F9B5 87F8 D412
OpenOffice.org Engineering at Sun: http://blogs.sun.com/GullFOSS
Please don't send personal mail to the erl@... account, which I use for
mailing lists only and don't read from outside Sun. Use erack@... Thanks.
On Tuesday, 2009-06-30 23:34:27 +0200, Regina Henschel wrote:
> Excel rounds down to integer. The comment in ODF spec 16.15.11 says that
> Gnumeric allow fractional N, but my Gnumeric 1.6.3 rounds down too. In
> the comment Kspread is said to allow fractional N, but I haven't got
> that program.
Just tried with KSpread 2.0rc1, it returns an error for fractional N.
>> What is "large" and what is "long lasting"?
>
> I would have to implement it in C++ to see how long it really lasts. The
> Basic macro lasts several seconds for x>10000. The effort is linear in x.
Basic of course is some orders of magnitude slower than C++.
> You are right to remember me to Boost, I have overlooked it. I had a
> look at Boost now. The Bessel functions (and a lot of others) are
> included in library "Math Toolkit" since version 1.35.0. I see version
> 1.34.0 in OOo. There is a description in
> http://www.boost.org/doc/libs/1_35_0/libs/math/doc/sf_and_dist/html/math_toolkit/special/bessel/bessel.html.
>
>
>
> Having an actual version of the Boost library would solve a lot of other
> accuracy problems too. I would prefer upgrading Boost library.
> When can the upgrade be done?
Don't know. I don't have time for it until OOo3.2, I'll try to ping
Thorsten to see if he's willing, he already did the upgrade to 1.34;
I just know he'll be on vaction soon, so it would take its time anyway.
> Nevertheless, I can provide a patch with the Deuflhard algorithm likely
> in time for OOo3.2 when give me a "go".
Yes, of course, that would be nice.
> BTW, I still need a decision on the UI name of the left tailed
> F-distribution to finish that work. I have FDISTL in mind.
Ah, I thought we already agreed on that, yes, I think FDISTL is fine.
Thanks
Eike
--
OOo/SO Calc core developer. Number formatter stricken i18n transpositionizer.
SunSign 0x87F8D412 : 2F58 5236 DB02 F335 8304 7D6C 65C9 F9B5 87F8 D412
OpenOffice.org Engineering at Sun: http://blogs.sun.com/GullFOSS
Please don't send personal mail to the erl@... account, which I use for
mailing lists only and don't read from outside Sun. Use erack@... Thanks.
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