[INTERNAL] 

::

 rank(self, DM A) -> int

Matrix rank.

Not available for all solvers

Extra doc: https://github.com/casadi/casadi/wiki/L_1kl

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/linsol.hpp#L126

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/linsol.cpp#L176-L181

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