[Getdp] Q: Lanczos error

[スズキ]

Hi,

I'm new to getdp (on Windows).  I tried to solve a 
simple eigenvalue problem using lanczos, and got an 
error: "Lanczos algorithm not available with the GSL".  
Questions:

(1) I took a look at the source code and found that 
lanczos routines are intentionally disabled when 
HAVE_GSL is defined.  Why is that?

(2) Is there a way to solve eigenvalue problems, 
either by enabling lanczos, or by using another 
algorithm?  

(3) I found a simple wave equation example in the 
mailing-list archive, in which the formulation is 
in time domain and resolution contains lanczos.  Does 
it mean that specifying lanczos automatically convert 
time-FEM into frequency domain, so I don't have to 
rewrite FEM manually for lanczos?  The example goes 
like this:

Formulation {
  { Name Wave; Type FemEquation; 
    Quantity { 
      { Name u; Type Local; NameOfSpace Hgrad; }
    }
    Equation {
      Galerkin { DtDt [ 1/c[] * Dof{u} , {u} ]; 
                 In Omega; Integration I1; Jacobian JVol; 
}

      Galerkin { [ c[] * Dof{d u} , {d u} ]; 
                 In Omega; Integration I1; Jacobian JVol; 
}

      Galerkin {  [ - dfdt[] , {u} ]; 
                 In Gamma_f; Integration I1; Jacobian
JSur;  }
    }
  }
}
Resolution {
...
  { Name Wave_pvp;
    System {
      { Name A; NameOfFormulation Wave; }
    }
    Operation { 
      GenerateSeparate[A]; 
      Lanczos[A, 19, {1:5}, 0]; 
      SaveSolutions[A] ;
    }
  }
}

Thank you for your help.  


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