All right, those work for me. Thanks!
Best,
Weixiong
在 2017年5月9日星期二 UTC-7下午6:48:05，Wolfgang Bangerth写道：
>
> On 05/09/2017 05:59 PM, Weixiong Zheng wrote:
> >
> > I got bothered a bit about the problem: the existence of some parameters
> > depends on the other parameters defining the problem. what I am doing
> now is
> > that I have two methods called: declare_parameter(prm) and
> > declare_other_parameter(prm,prm2) and further I do:
> >
> > void PROBLEM<dim>::declare_other_parameters(prm,prm2)
> > {
> > declare corresponding entries in prm2 after reading input parameters
> in prm;
> > }
> >
> > main ()
> > {
> > ParameterHandler prm, prm2;
> > PROBLEM<dimension>::declare_parameter (prm);
> > prm.read_input (argv[1]);
> > PROBLEM<dimension>::declare_other_parameter (prm,prm2);
> > prm2.read_input (argv[2]);
> > PROBLEM<dimension> prob (prm,prm2);
> > }
> >
> > As you see, I actually do declare entries for parameters for problem
> > definition and read them in the first file. After that I have to declare
> extra
> > entries depending on what I have read in the first file and read in
> another file.
> >
> > What I prefer is a way that I can put everything in one file, any idea
> for
> > that please?
>
> There isn't an easy one. The problem is that you can't read parameters
> that
> haven't been declared yet. So you can't declare parameters *in response
> to*
> other parameters.
>
> But there are two options:
>
> * You just declare all possible parameters; depending on the values given
> for
> some parameters, you're just going to ignore some of the others.
>
> * You could require the user to write the first set of parameters at the
> top
> of the file, and then use the 'last_line' argument of
> ParameterHandler::parse_input() to stop reading at a specific point, see
>
>
> https://dealii.org/developer/doxygen/deal.II/classParameterHandler.html#a030e84298d59cfea765f43d8600dee48
>
>
> You would then declare some additional parameters as you do above, and
> just
> re-read the *entire* file a second time (i.e., not specify an 'end_line').
>
> Best
> W.
>
> --
> ------------------------------------------------------------------------
> Wolfgang Bangerth email: bang...@colostate.edu
> <javascript:>
> www: http://www.math.colostate.edu/~bangerth/
>
>
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