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Re: [Help-gsl] change in gsl_multifit_linear_svd


From: Patrick Alken
Subject: Re: [Help-gsl] change in gsl_multifit_linear_svd
Date: Fri, 30 Sep 2016 11:48:34 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

Ok I've added the function

gsl_multifit_linear_rank

which now returns the effective rank of the matrix. It is in the git
repository

Patrick

On 09/29/2016 04:02 PM, Timothée Flutre wrote:
> Thanks for your answers!
>
> Patrick, indeed, after looking at the code, the difference arose between
> versions 1.16 and 2.0. However, I can't use gsl_multifit_linear because I
> also need the rank to compute the unbiased estimate of the error variance,
> as well as the p value.
> The rank was returned before by gsl_multifit_linear_svd, but not anymore.
> By looking at the current code, I see that the rank is computed inside
> multifit_linear_solve which is not available via the API.
>
> Is there a way to solve this without changing the API again?
>
> Tim
>
> 2016-09-22 18:00 GMT+02:00 <address@hidden>:
>
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>> Today's Topics:
>>
>>    1. change in gsl_multifit_linear_svd (Timoth?e Flutre)
>>    2. Re: change in gsl_multifit_linear_svd (Patrick Alken)
>>    3. Re: change in gsl_multifit_linear_svd (Mohammad Akhlaghi)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Wed, 21 Sep 2016 21:10:57 +0200
>> From: Timoth?e Flutre <address@hidden>
>> To: address@hidden
>> Subject: [Help-gsl] change in gsl_multifit_linear_svd
>> Message-ID:
>>         <CAGJVmuLYccg=YvFfRXi5Tsjfa45r2KVzS=t+1Q-
>> address@hidden>
>> Content-Type: text/plain; charset=UTF-8
>>
>> Hello,
>>
>> did gsl_multifit_linear_svd change at some point after GSL 1.16? I couldn't
>> see any mention of it in the NEWS file, but a user reported to me that my
>> code doesn't compile anymore with GSL 2.1.
>> Could someone add this somewhere in the NEWS file?
>>
>> Moreover, does someone know how I can use conditionals with the Autotools
>> (via ./configure) so that, if the user has GSL <= 1.16, the compiled code
>> uses gsl_multifit_linear_svd whereas if the user has GSL >= 2.0 the
>> compiled code uses gsl_multifit_linear?
>>
>> Best,
>> Tim
>>
>>
>> ------------------------------
>>
>> Message: 2
>> Date: Thu, 22 Sep 2016 06:12:26 +0100
>> From: Patrick Alken <address@hidden>
>> To: <address@hidden>
>> Subject: Re: [Help-gsl] change in gsl_multifit_linear_svd
>> Message-ID: <address@hidden>
>> Content-Type: text/plain; charset="utf-8"
>>
>> The linear least squares code was rewritten (I think prior to 2.0) so
>> its possible that the svd routine changed, but I don't remember exactly
>> what the change was! If there was an API change it should have been done
>> prior to 2.0 (which was the reason for jumping to 2.0 instead of 1.17).
>> Sorry for the headache you're having now - the behavior of
>> gsl_multifit_linear should be the same for both GSL versions - can you
>> just use that instead?
>>
>> On 09/21/2016 08:10 PM, Timoth?e Flutre wrote:
>>> Hello,
>>>
>>> did gsl_multifit_linear_svd change at some point after GSL 1.16? I
>> couldn't
>>> see any mention of it in the NEWS file, but a user reported to me that my
>>> code doesn't compile anymore with GSL 2.1.
>>> Could someone add this somewhere in the NEWS file?
>>>
>>> Moreover, does someone know how I can use conditionals with the Autotools
>>> (via ./configure) so that, if the user has GSL <= 1.16, the compiled code
>>> uses gsl_multifit_linear_svd whereas if the user has GSL >= 2.0 the
>>> compiled code uses gsl_multifit_linear?
>>>
>>> Best,
>>> Tim
>>
>>
>>
>>
>> ------------------------------
>>
>> Message: 3
>> Date: Thu, 22 Sep 2016 12:16:48 +0200
>> From: Mohammad Akhlaghi <address@hidden>
>> To: address@hidden
>> Subject: Re: [Help-gsl] change in gsl_multifit_linear_svd
>> Message-ID: <address@hidden>
>> Content-Type: text/plain; charset=utf-8; format=flowed
>>
>> On 09/21/2016 09:10 PM, Timoth?e Flutre wrote:
>>
>>> Moreover, does someone know how I can use conditionals with the Autotools
>>> (via ./configure) so that, if the user has GSL <= 1.16, the compiled code
>>> uses gsl_multifit_linear_svd whereas if the user has GSL >= 2.0 the
>>> compiled code uses gsl_multifit_linear?
>> Once installed, GSL also installs an executable script called
>> "gsl-config". If you run it with the "--version" option, this script
>> will print the installed version of GSL:
>>
>> $ gsl-config --version
>>
>> You can use the output of this command, along with "AX_COMPARE_VERSION"
>> (from the GNU Autoconf Archives) to check for the version. The link
>> bellow shows how we do it in GNU Astronomy Utilities when we need to
>> check the version of Ghostscript:
>>
>> http://git.savannah.gnu.org/cgit/gnuastro.git/tree/configure.ac
>> (See the part that starts with the "Check Ghostscript:" comment)
>>
>> You don't be needing the check on existance like our Ghostscript check,
>> since I assume you will be using `AC_SEARCH_LIBS' for GSL's existance.
>> You just need the indented part after `AC_MSG_CHECKING(Ghostscript
>> version)'.
>>
>> You can then pass the check's result into `config.h' and use the
>> information in your programming to decide which function to use.
>>
>> Cheers,
>> Mohammad
>>
>>
>>
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>>
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