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

[Tuomo Keskitalo]

Hello,

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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