[Users] -nan output.

Bilal Hameed bilalhameedawan962 at gmail.com
Thu Aug 27 20:48:36 CDT 2020


On Fri, Aug 28, 2020, 6:34 AM Roland Haas <rhaas at illinois.edu> wrote:

> Hello Bilal,
> > Thanks Sir. But I am still confused about, why changing "itlast"
> generated
> > that issue as it only controls "last iteration"?
> Changing itlast to > 0 makes Cactus enter an evolution loop where it
> will cycle time levels bringing fresh, unitialized time levels to the
> top of the set of time levels. Since there is nothing that would evolve
> the data or re-initialize the timelevels your are left with unitialized
> time levels, i.e. NaNs.
> Just to be explicit: iteration is not some sort of iteration in a
> non-linear solver. It is (more or less) the time step of a hyperbolic
> evolution.
> If you want more multigrid (W, V, whatnot) cycles then you have to
> change CT_MultiLevel's parameters. I would suggest having a look at
> param.ccl of CT_MultiLevel to see which ones are available.
> Yours,
> Roland
> --
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