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Suppress invalid argument warnings in inverse Mollweide projection #3283

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Suppress invalid argument warnings in inverse Mollweide projection #3283

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11 changes: 6 additions & 5 deletions lib/matplotlib/projections/geo.py
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Original file line number Diff line number Diff line change
Expand Up @@ -484,11 +484,12 @@ def transform_non_affine(self, xy):
x = xy[:, 0:1]
y = xy[:, 1:2]

# from Equations (7, 8) of
# http://mathworld.wolfram.com/MollweideProjection.html
theta = np.arcsin(y / np.sqrt(2))
lon = (np.pi / (2 * np.sqrt(2))) * x / np.cos(theta)
lat = np.arcsin((2 * theta + np.sin(2 * theta)) / np.pi)
with np.errstate(invalid='ignore'):
# from Equations (7, 8) of
# http://mathworld.wolfram.com/MollweideProjection.html
theta = np.arcsin(y / np.sqrt(2))
lon = (np.pi / (2 * np.sqrt(2))) * x / np.cos(theta)
lat = np.arcsin((2 * theta + np.sin(2 * theta)) / np.pi)

return np.concatenate((lon, lat), 1)
transform_non_affine.__doc__ = Transform.transform_non_affine.__doc__
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