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fix: elliptic_func returns NaN when input has 1 element (affects F17, F29 at 10D) #46

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fix: elliptic_func returns NaN when input has 1 element (affects F17, F29 at 10D) #46

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5 changes: 3 additions & 2 deletions opfunu/utils/operator.py
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Original file line number Diff line number Diff line change
Expand Up @@ -126,9 +126,10 @@ def non_continuous_rastrigin_func(x):


def elliptic_func(x):
x = np.array(x).ravel()
ndim = len(x)
idx = np.arange(0, ndim)
if ndim == 1:
return x[0] ** 2 # degenerate 1D case: avoids (ndim-1) = 0 division
idx = np.arange(ndim)
return np.sum(10 ** (6.0 * idx / (ndim - 1)) * x ** 2)


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