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Remove scipy dependency by replacing eigvals() function #138

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Remove scipy dependency by replacing eigvals() function #138

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0ea75b6
Remove scipy dependency by replacing eigvals() function
brookshsmith Feb 24, 2023
8d5582c
Add comment to clarify the change
brookshsmith Feb 24, 2023
313e9c9
Merge branch 'master' into removeScipyDependency
brookshsmith Jun 15, 2024
47478a1
Merge branch 'master' into removeScipyDependency
brookshsmith Sep 21, 2024
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8 changes: 5 additions & 3 deletions anastruct/fem/system_components/solver.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,8 +3,6 @@
from typing import TYPE_CHECKING, Optional

import numpy as np
from scipy import linalg # type: ignore

from anastruct.basic import converge

if TYPE_CHECKING:
Expand Down Expand Up @@ -112,7 +110,11 @@ def det_linear_buckling(system: "SystemElements") -> float:
kg = system.reduced_system_matrix - k0
# solve (k -λkg)x = 0

eigenvalues = np.abs(linalg.eigvals(k0, kg))
# The following two lines are equivalent to the cleaner
# scipy.linalg.eigvals(k0, kg), but doing this allows us
# to drop the scipy dependency
invkg_k0 = np.linalg.inv(kg) * k0
eigenvalues = np.abs(np.linalg.eigvals(invkg_k0))
return float(np.min(eigenvalues))


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