How to properly install qpsolvers for Python on Windows?-CodePudding

I am trying to install qpsolvers using pip. The installation goes without errors, and the module imports properly afterwards.

However, qpsolvers has no available solvers for it to use :

import qpsolvers

print(qpsolvers.available_solvers)

returns [].

Of course, trying to do anything results in an error:

SolverNotFound: solver 'quadprog' is not available

even on the exemple file for quadprog for instance.

I have checked the location of the package, and it looks like the solvers are there : solver files in the package's solvers folder

Uninstalling and reinstalling or trying older versions didn't work.

How can I fix this?

CodePudding user response：

I install qpsolvers using pip install qpsolvers. the link is here: https://pypi.org/project/qpsolvers/

I run the test code to check it works:

from numpy import array, dot
from qpsolvers import solve_qp
import qpsolvers

M = array([[1., 2., 0.], [-8., 3., 2.], [0., 1., 1.]])
P = dot(M.T, M)  # this is a positive definite matrix
q = dot(array([3., 2., 3.]), M).reshape((3,))
G = array([[1., 2., 1.], [2., 0., 1.], [-1., 2., -1.]])
h = array([3., 2., -2.]).reshape((3,))
A = array([1., 1., 1.])
b = array([1.])

x = solve_qp(P, q, G, h, A, b)
print("QP solution: x = {}".format(x))

it produces a result:

QP solution: x = [ 0.30769231 -0.69230769  1.38461538]

I also run the line of code in the question:

print(qpsolvers.available_solvers)

this also produces a result:

['quadprog']

So it all seems fine. I am using vscode and windows10 with python3.9.