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Re: [Bug-gsl] ode-initval2 testsuite failure

From: Tuomo Keskitalo
Subject: Re: [Bug-gsl] ode-initval2 testsuite failure
Date: Mon, 21 Jan 2013 19:11:35 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130106 Thunderbird/17.0.2


On 01/21/2013 05:42 PM, Frantisek Kluknavsky wrote:

I believe that the design of test_extreme_problems() is not good. Such
an unstable combination of equation, solver and parameters tests one
thing - if a machine behaves exactly as 64-bit Intels do (not sure about
IEEE 754). What should it actually test? Is there some
documentation/explanation/rationale/guideline? I can not fix it if I do
not understand, what is it supposed to do.

I put test_extreme_problems() in as an "acid test" for stiff ODE solvers. It includes a few problems that are numerically beyond classical methods. test_extreme_problems() gives some kind of evidence that ode-initval2 has methods that can tackle these kinds of numerical nightmares. It is a good question if those tests are really appropriate for a standard check.

Regarding msbdf decrease-order-by-2 problem, I was unable to find the
bug in a reasonable amount of time and energy. I can not reproduce it
consistently. Sorry.

Thanks for your efforts. I'll try to find time and see about these. If there is anything else you found out, please let me know.


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