51 lines
1.4 KiB
Cython
51 lines
1.4 KiB
Cython
# Author: John Kirkham, Meekail Zain, Thomas Fan
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from libc.math cimport isnan, isinf
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from cython cimport floating
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cpdef enum FiniteStatus:
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all_finite = 0
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has_nan = 1
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has_infinite = 2
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def cy_isfinite(floating[::1] a, bint allow_nan=False):
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cdef FiniteStatus result
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with nogil:
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result = _isfinite(a, allow_nan)
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return result
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cdef inline FiniteStatus _isfinite(floating[::1] a, bint allow_nan) noexcept nogil:
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cdef floating* a_ptr = &a[0]
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cdef Py_ssize_t length = len(a)
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if allow_nan:
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return _isfinite_allow_nan(a_ptr, length)
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else:
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return _isfinite_disable_nan(a_ptr, length)
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cdef inline FiniteStatus _isfinite_allow_nan(floating* a_ptr,
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Py_ssize_t length) noexcept nogil:
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cdef Py_ssize_t i
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cdef floating v
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for i in range(length):
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v = a_ptr[i]
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if isinf(v):
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return FiniteStatus.has_infinite
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return FiniteStatus.all_finite
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cdef inline FiniteStatus _isfinite_disable_nan(floating* a_ptr,
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Py_ssize_t length) noexcept nogil:
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cdef Py_ssize_t i
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cdef floating v
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for i in range(length):
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v = a_ptr[i]
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if isnan(v):
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return FiniteStatus.has_nan
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elif isinf(v):
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return FiniteStatus.has_infinite
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return FiniteStatus.all_finite
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