Setting initial solution in highspy

[Dimjoy]

Hello!
As far as I understand, currently there are two call signatures for setSolution method (according to _core.pyi file):

@overload
def setSolution(self, arg0: HighsSolution) -> HighsStatus: ...
@overload
def setSolution(self, arg0: int, arg1: numpy.ndarray[numpy.int32], arg2: numpy.ndarray[numpy.float64]) -> HighsStatus: ...

Apparently, the second mimics Highs_setSparseSolution method from the C API. I am trying to use it for a simple LP-problem from the Examples section of the Guide (2 continuous variables and 2 constraints) with the following line of code:

h.setSolution(1, np.array([0]), np.array([3.1]))

which fails with the following error message:

TypeError: setSolution(): incompatible function arguments. The following argument types are supported:
1. (self: highspy._core._Highs, arg0: HighsSolution) -> highspy._core.HighsStatus
Invoked with: <highspy.highs.Highs object at 0x00000229BCD88AC0>, 1, array([0]), array([3.1])

Am I doing it wrong? Or setting partial solution is not supported right now in the Python API?

[kutlay]

I'm wondering about this too.

[jajhall]

It's strange that @Dimjoy and @kutlay have had problems with this. I've just experimented with

https://github.com/ERGO-Code/HiGHS/blob/latest/examples/knapsack.py

and had no problems. The two call signatures for setSolution were added at the same time, but maybe the version of highspy you were using dated from before the introduction of setSparseSolution, when there was a single direct map of setSolution.