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Improve cot() function, to ensure x is not exactly a multiple of pi/2 #3

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Improve cot() function, to ensure x is not exactly a multiple of pi/2 #3

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5 changes: 4 additions & 1 deletion src/sphstat/utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -324,7 +324,10 @@ def cot(x):
:return: Cotangent of the input
:rtype: float
"""
return 1/np.tan(x)

# By subtracting the smallest positive representable number (eps) from x,
# the expression ensures that x is not exactly a multiple of pi/2 and thus the tangent of x is defined.
return 1/np.tan(x - np.finfo(float).eps)


def poltoll(th: float, ph: float) -> tuple:
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