Fix/pbox epistemic only case #7
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- Add new SobolComp component for computing Sobol indices - Extend UQPCEGroup with compute_sobols option to expose sensitivity indices - Add model_matrix to interface.initialize() return values - Sobol indices are computed from PCE coefficients using interaction matrix - Outputs main effects (sobols) and total effects (total_sobols) for each response
When there are no aleatory variables (only epistemic), create an empty aleat_resample array with shape (aleat_samps, 0) for consistency. This ensures downstream code that expects the aleat_resample attribute to exist doesn't fail. Previously, the method would return early without creating the attribute, which could cause AttributeError in code that expects it to exist.
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Fix: Handle epistemic-only case by creating empty aleat_resample array
When there are no aleatory variables (only epistemic), create an empty
aleat_resample array with shape (aleat_samps, 0) for consistency. This
ensures downstream code that expects the aleat_resample attribute to
exist doesn't fail.
Previously, the method would return early without creating the attribute,
which could cause AttributeError in code that expects it to exist.