How can a symengine matrix be saved to a file in Python?

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You can use the NumPy library to convert the Symengine matrix to a NumPy array, which can then be saved to a file using the NumPy's save function.

import numpy as np
from symengine import Matrix

# create a Symengine matrix
M = Matrix([[1, 2], [3, 4]])

# convert the matrix to a NumPy array
N = np.array(M.tolist())

# save the NumPy array to a file
np.save('matrix.npy', N)

To load the saved matrix from the file, you can use the NumPy's load function:

# load the saved matrix from the file
N = np.load('matrix.npy')

# convert the NumPy array back to a Symengine matrix
M = Matrix(N)