Hi,

Don't know if this is relevant but I cannot find an answer from the 
previous posts.

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?

Best,
Weixiong

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