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Appendix
Reference information is provided in the appendix.
Read MAT, LUD, RHS and STR Files
The .mat file, .lud file and .rhs file are not generated by default, but can be read externally.
Read the STR File
Read the .str file that contains the solution vector x of the system of linear equations Ax=y.

Welcome
Release Notes
See what's new in the latest release.
Get Started
The Feko Getting Started Guide contains step-by-step instructions on how to get started with Feko.
Examples
The Feko Example Guide contains a collection of examples that teaches you Feko concepts and essentials.
Introduction to Feko
Feko is a comprehensive electromagnetic solver with multiple solution methods that is used for electromagnetic field analyses involving 3D objects of arbitrary shapes.
CADFEKO
CADFEKO is used to create and mesh the geometry or model mesh, specify the solution settings and calculation requests in a graphical environment.
POSTFEKO
POSTFEKO, the Feko post processor, is used to display the model (configuration and mesh), results on graphs and 3D views.
EDITFEKO
EDITFEKO is used to construct advanced models (both the geometry and solution requirements) using a high-level scripting language which includes loops and conditional statements.
Feko Solution Methods
One of the key features in Feko is that it includes a broad set of unique and hybridised solution methods. Effective use of Feko features requires an understanding of the available methods.
Optimisation in Feko
Feko offers state-of-the-art optimisation engines based on generic algorithm (GA) and other methods, which can be used to automatically optimise the design and determine the optimum solution.
Feko Utilities
The Feko utilities consist of PREFEKO, OPTFEKO, ADAPTFEKO, the Launcher utility, Updater and the crash reporter.
Description of the Output File of Feko
Feko writes all the results to an ASCII output file .out as well as a binary output file .bof for usage by POSTFEKO. Use the .out file to obtain additional information about the solution.
Feko Application Macros
A large collection of application macros are available for CADFEKO and POSTFEKO.
Scripts and Application Programming Interface (API)
CADFEKO and POSTFEKO have a powerful, fast, lightweight scripting language integrated into the application allowing you to create models, get hold of simulation results and model configuration information as well as manipulation of data and automate repetitive tasks.
Appendix
Reference information is provided in the appendix.
- Application Programming Interface (API)
  CADFEKO and POSTFEKO have a powerful, fast, lightweight scripting language integrated into the application that allows you to create models, get hold of simulation results and model configuration information and much more.
- EDITFEKO Cards
  Each geometry and calculation request are entered on a separate line in the .pre and are referred to as cards.
- How-Tos
  A collection of how-tos are included that covers advanced concepts.
- FAQ
  A collection of frequently asked questions (FAQ) relating to advanced concepts are included.
- Troubleshooting
  Common problems that you may encounter are discussed as well as their solutions.
- Meshing
  When meshing a model, you can either use the automatic meshing algorithm to calculate the appropriate mesh settings or you can specify the mesh sizes. When you specify the mesh sizes, the mesh sizes should adhere to certain guidelines.
- SAR Standards
  Feko makes use of a local peak SAR algorithm.
- Solution Control
  Control the execution of Feko by specifying the memory management and environment variables.
- Read MAT, LUD, RHS and STR Files
  The .mat file, .lud file and .rhs file are not generated by default, but can be read externally.
  - Read MAT and LUD Files Using Fortran
    Read the .mat file that contains the elements of the MoM matrix A and the .lud file that contains the LU decomposition of the method of moments matrix A.
  - Read the RHS File
    Read the .rhs file containing the right-hand side vector y representing the method of moments (MoM) excitation.
  - Read the STR File
    Read the .str file that contains the solution vector x of the system of linear equations Ax=y.
  - MAT2ASCII Utility
    Run the mat2ascii utility from the command line to convert a .mat file to ASCII format. The mat2ascii utility is supported for both the 64-bit Windows and Linux platforms.
- Integration With Other Tools
  Feko integrates with various products within Altair HyperWorks Products such as HyperStudy. Integration with third-party products is also supported through the powerful scripting and plug-in infrastructure.
- SPICE3f5
  Use the correct structure, convention and syntax for a SPICE circuit definition in Feko.
- List of Acronyms and Abbreviations
  View the list of commonly used acronyms in Feko.
- Summary of Files
  Feko creates and uses many different file types. It is useful to know what is stored in the various files and weather they were created by Feko and if it is safe to delete them. The files are grouped as either native files that have been created by Feko or non-native files that are supported by Feko. Non-native files are often exported by Feko even if the formats are not under the control of the Feko development team.
- Common Errors and Warnings
  A Feko Errors, Warnings and Notes Reference Guide is available as a reference for messages that may be encountered in Feko.

Read the STR File

Read the .str file that contains the solution vector x of the system of linear equations Ax=y.

Export the .str file using one of the following workflows:

Use the PS card in EDITFEKO.
Saving the .str file in CADFEKO.

The .str file is saved as a binary file, but can be converted into ASCII format by using the str2ascii utility. When using the -r option, a special .str file format is created that allows the re-import of the file into Feko. This gives you the power to visualise, for instance, characteristic modes.

Use the syntax:

str2ascii <filename.str> -r > ascii.str

This results in a file ascii.str with an ASCII format of the .str file which Feko can read again. The file contains the complex basis function coefficients in real and imaginary format.

    8.2676511990e-05    -5.9745463799e-05
    1.2218137786e-04    -2.4529271790e-04
   -2.7489665728e-05     1.6734208727e-04
    9.3781476258e-05    -1.1630237673e-04
    1.0987524472e-04    -1.8260254976e-04