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Fix incorrect stride calculations in LogLocator.tick_values() #25405

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Merged
merged 7 commits into from
Mar 28, 2023
Merged

Fix incorrect stride calculations in LogLocator.tick_values() #25405

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da5796c
feat: add 2 tests based on good/bad plot from upstream issue
haval0 Mar 1, 2023
1fc5591
fix: make "bad plot" test fail because fix isn't implemented yet
haval0 Mar 1, 2023
01eff90
Merge pull request #2 from haval0/test-good-bad-plot
haval0 Mar 7, 2023
6d03ed8
fix: revert simplification of stride calculation in LogLocator (#3)
II-Day-II Mar 7, 2023
503356e
fix: make tests slightly error tolerant (#4)
haval0 Mar 7, 2023
874e6ea
mnt: simplify stride calculation in LogLocator.tick_values
II-Day-II Mar 8, 2023
e1813b5
Merge pull request #5 from haval0/do-it-with-algebra
haval0 Mar 8, 2023
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20 changes: 20 additions & 0 deletions lib/matplotlib/tests/test_ticker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -239,6 +239,26 @@ def test_set_params(self):
assert loc._base == 4
assert list(loc._subs) == [2.0]

def test_tick_values_correct(self):
ll = mticker.LogLocator(subs=(1, 2, 5))
test_value = np.array([1.e-01, 2.e-01, 5.e-01, 1.e+00, 2.e+00, 5.e+00,
1.e+01, 2.e+01, 5.e+01, 1.e+02, 2.e+02, 5.e+02,
1.e+03, 2.e+03, 5.e+03, 1.e+04, 2.e+04, 5.e+04,
1.e+05, 2.e+05, 5.e+05, 1.e+06, 2.e+06, 5.e+06,
1.e+07, 2.e+07, 5.e+07, 1.e+08, 2.e+08, 5.e+08])
assert_almost_equal(ll.tick_values(1, 1e7), test_value)

def test_tick_values_not_empty(self):
mpl.rcParams['_internal.classic_mode'] = False
ll = mticker.LogLocator(subs=(1, 2, 5))
test_value = np.array([1.e-01, 2.e-01, 5.e-01, 1.e+00, 2.e+00, 5.e+00,
1.e+01, 2.e+01, 5.e+01, 1.e+02, 2.e+02, 5.e+02,
1.e+03, 2.e+03, 5.e+03, 1.e+04, 2.e+04, 5.e+04,
1.e+05, 2.e+05, 5.e+05, 1.e+06, 2.e+06, 5.e+06,
1.e+07, 2.e+07, 5.e+07, 1.e+08, 2.e+08, 5.e+08,
1.e+09, 2.e+09, 5.e+09])
assert_almost_equal(ll.tick_values(1, 1e8), test_value)


class TestNullLocator:
def test_set_params(self):
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2 changes: 1 addition & 1 deletion lib/matplotlib/ticker.py
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Expand Up @@ -2386,7 +2386,7 @@ def tick_values(self, vmin, vmax):
# Get decades between major ticks.
stride = (max(math.ceil(numdec / (numticks - 1)), 1)
if mpl.rcParams['_internal.classic_mode'] else
(numdec + 1) // numticks + 1)
numdec // numticks + 1)

# if we have decided that the stride is as big or bigger than
# the range, clip the stride back to the available range - 1
Expand Down