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Backport PR #30162 on branch v3.10.x (TST: Fix runtime error checking NaN input to format_cursor_data) #30167

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Merged
merged 1 commit into from
Jun 13, 2025
Merged

Backport PR #30162 on branch v3.10.x (TST: Fix runtime error checking NaN input to format_cursor_data) #30167

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6 changes: 4 additions & 2 deletions lib/matplotlib/cbook.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2208,6 +2208,9 @@ def _g_sig_digits(value, delta):
Return the number of significant digits to %g-format *value*, assuming that
it is known with an error of *delta*.
"""
# For inf or nan, the precision doesn't matter.
if not math.isfinite(value):
return 0
if delta == 0:
if value == 0:
# if both value and delta are 0, np.spacing below returns 5e-324
Expand All @@ -2221,11 +2224,10 @@ def _g_sig_digits(value, delta):
# digits before the decimal point (floor(log10(45.67)) + 1 = 2): the total
# is 4 significant digits. A value of 0 contributes 1 "digit" before the
# decimal point.
# For inf or nan, the precision doesn't matter.
return max(
0,
(math.floor(math.log10(abs(value))) + 1 if value else 1)
- math.floor(math.log10(delta))) if math.isfinite(value) else 0
- math.floor(math.log10(delta)))


def _unikey_or_keysym_to_mplkey(unikey, keysym):
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