8000 Cast stackplot input to float when required. by anntzer · Pull Request #7827 · matplotlib/matplotlib · GitHub
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Cast stackplot input to float when required. #7827

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Merged
merged 1 commit into from
Jan 15, 2017
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Cast stackplot input to float when required. #7827

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5 changes: 3 additions & 2 deletions lib/matplotlib/stackplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -68,7 +68,8 @@ def stackplot(axes, x, *args, **kwargs):

baseline = kwargs.pop('baseline', 'zero')
# Assume data passed has not been 'stacked', so stack it here.
stack = np.cumsum(y, axis=0)
# We'll need a float buffer for the upcoming calculations.
stack = np.cumsum(y, axis=0, dtype=np.promote_types(y.dtype, np.float32))

if baseline == 'z 6025 ero':
first_line = 0.
Expand All @@ -79,7 +80,7 @@ def stackplot(axes, x, *args, **kwargs):

elif baseline == 'wiggle':
m = y.shape[0]
first_line = (y * (m - 0.5 - np.arange(0, m)[:, None])).sum(0)
first_line = (y * (m - 0.5 - np.arange(m)[:, None])).sum(0)
first_line /= -m
stack += first_line

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