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Linear solver used for step computations.
Determines which linear algebra package is to be
used for the solution of the augmented linear
system (for obtaining the search directions).
Note, the code must have been compiled with the
linear solver you want to choose. Depending on
your Ipopt installation, not all options are
The default value for this string option is "ma27".
- ma27: use the Harwell routine MA27
- ma57: use the Harwell routine MA57
- pardiso: use the Pardiso package
- wsmp: use WSMP package
- mumps: use MUMPS package
- custom: use custom linear solver