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Fix fill_between with decreasing data #9236

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Merged
merged 2 commits into from
Sep 26, 2017
Merged

Fix fill_between with decreasing data #9236

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e6a115c
BUG: Fix fill_between(x) with decreasing data (Fixes #9235)
dopplershift Sep 26, 2017
61f4fa3
Add test for #9235
dopplershift Sep 26, 2017
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BUG: Fix fill_between(x) with decreasing data (Fixes #9235) 
One of the calls to interp passes data which is not guaranteed to be in
increasing order, which interp requires. Just use argsort the data, like
is done above.
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@dopplershift
dopplershift committed Sep 26, 2017
commit e6a115c936e47e21b4de9b1374cfc296fdb240a2
8 changes: 6 additions & 2 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4876,7 +4876,9 @@ def get_interp_point(ind):
diff_order = diff_values.argsort()
diff_root_x = np.interp(
0, diff_values[diff_order], x_values[diff_order])
diff_root_y = np.interp(diff_root_x, x_values, y1_values)
x_order = x_values.argsort()
diff_root_y = np.interp(diff_root_x, x_values[x_order],
y1_values[x_order])
return diff_root_x, diff_root_y

start = get_interp_point(ind0)
Expand Down Expand Up @@ -5026,7 +5028,9 @@ def get_interp_point(ind):
diff_order = diff_values.argsort()
diff_root_y = np.interp(
0, diff_values[diff_order], y_values[diff_order])
diff_root_x = np.interp(diff_root_y, y_values, x1_values)
y_order = y_values.argsort()
diff_root_x = np.interp(diff_root_y, y_values[y_order],
x1_values[y_order])
return diff_root_x, diff_root_y

start = get_interp_point(ind0)
Expand Down