MAINT: special: remove one libnpymath
dependency; more NPY_
-> C99
#16816
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Replacements:
NPY_NAN
->NAN
NPY_INFINITY
->INFINITY
NPY_PI
->M_PI
NPY_E
->M_E
npy_isnan
->isnan
npy_isinf
->isinf
npy_isfinite
->isfinite
npy_copysign
->copysign
npy_signbit
->signbit
Also cleans up a lot of Cython imports, and removes one
libnpymath
inclusion. That removal reduces binary size and works towards not depending onlibnpymath
at all - see numpy/numpy#20880.Things brings us down to 13 places where we still include
numpy/npy_math.h
.