Sign function:

::

 sign(float x) -> float
 sign(DM x) -> DM
 sign(SX x) -> SX
 sign(MX x) -> MX

sign(x) := -1 for x<0 sign(x) := 1 for x>0, sign(0) := 0 sign(NaN) := NaN

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

Doc source: https://github.com/casadi/casadi/blob/develop/casadi/core/generic_expression.hpp#L571

Implementation: https://github.com/casadi/casadi/blob/develop/casadi/core/generic_expression.hpp#L571-L573

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