4.7. Restrictions and Recommendations for Matrix Operations

The following restrictions and recommendations apply when using APDL Math matrix operations:

  • You cannot directly modify a sparse matrix in APDL Math. You must export it from APDL Math to modify it:

    • Export the matrix in an ASCII format (for example, *EXPORT,,MMF).

    • Edit the file.

    • Import the matrix back in (*SMAT,,,IMPORT,MMF).

  • When working with matrices and vectors, care must be taken to insure that any operations are done using consistent ordering (see Degree of Freedom Ordering).