Dear Mohammad, Thank you for your answer.
You are right. But at the moment I have all the results I need for publication. We are writing the paper and I think it would be awful to repeat the hole --otherwise correct-- calculations in this phase of our work just because there is a newer version of a software around. Best regards, Gábor On 2017. december 10. 20:05:25 Mohammad Akhlaghi wrote: > Dear Gábor, > > You don't need root access to build and install a different version of GSL > (or any software) on a server. A complete description of how to do it is > given here: > > https://www.gnu.org/software/gnuastro/manual/html_node/Installation-directory.html > > Following the names in that page, to compile your own programs with your GSL > installation (not the server's), just add these two options to your > compilation command (they are described in that page). > > -I/YOUR-HOME-DIR/.local/include > -L/YOUR-HOME-DIR/.local/lib > > Cheers, > Mohammad > > On December 10, 2017 7:34:32 PM GMT+01:00, Halasz Gabor > <[email protected]> wrote: > >Dear Tuomo, > > > >Thank you for your answer. > > > >Actually I have found the reference for Gear's paper but never found an > >explanation what is the difference between gear1 and gear2 in GSL. > >Actually all mentioning of Gear's method in new documents are similar > >to the following one: > >"the class of BDFs or commonly understood as Gear’s Method". > > > >But if it is a "class of methods" it would be nice if I can make it > >clear which variant I have used. > > > >I am using GSL on a server for which I have no root access, so I can > >not change the version as fast as I would like to publish our results. > >But despite of the old version, gear2 is an msbdf variant and bsimp is > >also available in this GSL version 1.13. > > > >Maybe there is a wider palette of suitable methods in the newer > >versions, but I am satisfied with the old version. Two of the methods > >provided the same results with high accuracy and these results are in > >agreement with the expectations. > > > >Other methods provided very similar results for a wide range of the > >parameters. Usually they were faster and sometimes provided results > >even a bit closer to the "expectations". But they failed --including > >rk2imp, gear1 or bsimp-- for the cases where I needed an extreme long > >integration. > > > >Best regards, > >Gábor > > > > > >On 2017. december 10. 19:23:33 Tuomo Keskitalo wrote: > >> Hi, > >> > >> for rk4imp I suggest this reference: > >> > >> Ascher, U.M., Petzold, L.R., Computer methods for ordinary > >> differential and differential-algebraic equations, SIAM, > >> Philadelphia, 1998. ISBN 0898714125, 9780898714128 > >> > >> I think those old Gear methods are based on this reference: > >> > >> Gear, C.W., Numerical Initial Value Problems in Ordinary Differential > > > >> Equations, 1971. > >> > >> However, I guess you really don't want to use those old deprecated > >> ode-initval methods. Instead, please updgrade to GSL version 2.4, use > > > >> ode-initval2, and try e.g. msbdf or bsimp methods, if your ODE system > >is > >> stiff. > >> > >> BR, > >> Tuomo > >> > >> On 10.12.2017 13:48, Halasz Gabor wrote: > >> > Hello, > >> > > >> > I have a problem with finding proper references and descriptions > >for some methods I have used for solving ODEs with GSL version 1.13. > >> > For the stepping functions gear1(2) the info page and the manuals > >only contain the following simple description: M=1(2) implicit Gear > >method. > >> > > >> > I am especially interested in methods rk4imp and gear2 as all the > >other available ones in version 1.13 was not working properly for my > >ODEs. > >> > > >> > Best regards, > >> > Gábor > >> > > >> > > >> > > >> > > >> > >> > >> > >
