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fix: cast principal area moments to real type to ensure no imaginary part #370

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Merged
mortenengen merged 1 commit into from
Aug 28, 2026
Merged

fix: cast principal area moments to real type to ensure no imaginary part #370

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10 changes: 6 additions & 4 deletions structuralcodes/geometry/profiles/_base_profile.py
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Original file line number Diff line number Diff line change
Expand Up @@ -122,10 +122,12 @@ def _find_principals_direction_and_moments(self):
)
max_idx = np.argmax(eigres[0])
min_idx = 0 if max_idx == 1 else 1
self._Icsi = eigres[0][max_idx]
self._Ieta = eigres[0][min_idx]
self._theta = np.arccos(
np.dot(np.array([1, 0]), eigres[1][:, max_idx])
# The principal values are cast to real type to ensure no imaginary
# part is present
self._Icsi = np.real(eigres[0][max_idx])
self._Ieta = np.real(eigres[0][min_idx])
self._theta = np.real(
np.arccos(np.dot(np.array([1, 0]), eigres[1][:, max_idx]))
)

@property
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10 changes: 7 additions & 3 deletions structuralcodes/sections/_beam_section.py
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Original file line number Diff line number Diff line change
Expand Up @@ -283,9 +283,13 @@ def find_principal_axes_moments(iyy, izz, iyz):
eigres = np.linalg.eig(np.array([[iyy, iyz], [iyz, izz]]))
max_idx = np.argmax(eigres[0])
min_idx = 0 if max_idx == 1 else 1
i11 = eigres[0][max_idx]
i22 = eigres[0][min_idx]
theta = np.arccos(np.dot(np.array([1, 0]), eigres[1][:, max_idx]))
# The principal values are cast to real type to ensure no imaginary
# part is present
i11 = np.real(eigres[0][max_idx])
i22 = np.real(eigres[0][min_idx])
theta = np.real(
np.arccos(np.dot(np.array([1, 0]), eigres[1][:, max_idx]))
)
return i11, i22, theta

gp.i11, gp.i22, gp.theta = find_principal_axes_moments(
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