Introduction

Features:

• All computations may be run on parallel systems, such as clusters of PCs.
• The geometry may contain lossy, dispersive materials both for time domain and eigenvalue computations.
• Periodic boundary conditions for all three cartesian directions can be specified simultaneously for eigenvalue computations.
• The geometry is approximated by generalised diagonal fillings or by smooth patches. In both cases the approximation error is reduced about by a factor of ten, compared to an approximisation with simple diagonal fillings.
• The time domain computation uses "Perfectly Matched Layers" for it's absorbing boundary conditions.
• The programs can be run interactively. The commands are explained when you issue the special command help.
• The solver and the postprocessor have a built-in macro processor.
  • You can define symbols storing numerical values or character values.
  • Arithmetic expression evaluator.
  • You can groups of commands as macro's. The macro's can have an unlimited amount of parameters.
  • 'do-loop's are implemented.
  • 'if' 'elseif' 'else' 'endif'
• Almost all commands may be abbreviated as long the abbreviation is unique in context.

GdfidL consists of 5 separate programs that work together. These programs are:

• gd1 & single.gd1: These programs read the description of the problem and compute resonant fields or time dependent fields. gd1 computes in double precision, while single.gd1 computes in single precision. single.gd1 needs somewhat less memory and often less cpu-time.
• gd1.pp : This is the postprocessor. It displays the fields, computes integrals over the fields to compute quality factors and the like. It also computes scattering parameters and wakepotentials from data that have been computed by gd1 or single.gd1.
• gd1.3dplot: This program displays the 3D-plots on an X11 terminal and produces PostScript files.
• mymtv2: This program displays the 1D and 2D-plots on a X11 terminal and produces PostScript files

mymtv2 was not written by me, but is a modified version of the program plotmtv written by Kenny Toh. The original sources for plotmtv can be found on the internet: plotmtv can be found at ftp.x.org: /contrib/applications/Plotmtv.1.3.2.tar.Z