FAQ 003626 EN-US


Robert Vogl Calculation RFEM

Which matrix solver method should I use, direct or iterative?


Which method leads to results faster depends on the complexity of the model and the amount of available RAM:

  • For small and medium sized systems, the direct method is more effective.
  • For very large structures, the iterative method leads to results more quickly.
In case that the matrices using the direct method cannot be saved any longer in the main memory, Windows starts to move parts of the data to the hard disk. This can be recognized by strong hard disk activity and a low processor load in Task Manager. This memory problem can be avoided by switching to the iterative ICG (Incomplete Conjugate Gradient) calculation method. 


Matrix solver method Directly Iteratively Solver Equation system

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RFEM Main Program
RFEM 5.xx

Main Program

Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements

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3,540.00 USD