[INTERNAL] 

::

 join_primitives(self, [MX] v) -> MX

Join an expression along symbolic primitives.

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

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/mx.hpp#L317

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/mx.cpp#L921-L927

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