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Small improvements to aitoff projection. #19076

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Dec 8, 2020
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Small improvements to aitoff projection. #19076

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7 changes: 2 additions & 5 deletions lib/matplotlib/projections/geo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -264,10 +264,7 @@ def transform_non_affine(self, ll):
cos_latitude = np.cos(latitude)

alpha = np.arccos(cos_latitude * np.cos(half_long))
# Avoid divide-by-zero errors using same method as NumPy.
alpha[alpha == 0.0] = 1e-20
# We want unnormalized sinc. numpy.sinc gives us normalized
sinc_alpha = np.sin(alpha) / alpha
sinc_alpha = np.sinc(alpha / np.pi) # np.sinc is sin(pi*x)/(pi*x).

x = (cos_latitude * np.sin(half_long)) / sinc_alpha
y = np.sin(latitude) / sinc_alpha
Expand All @@ -282,7 +279,7 @@ class InvertedAitoffTransform(_GeoTransform):
def transform_non_affine(self, xy):
# docstring inherited
# MGDTODO: Math is hard ;(
return xy
return np.full_like(xy, np.nan)

def inverted(self):
# docstring inherited
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