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Backport PR #25547 on branch v3.7.x (FIX: _safe_first_finite on all non-finite array) #25879

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Merged
merged 1 commit into from
May 13, 2023
Merged

Backport PR #25547 on branch v3.7.x (FIX: _safe_first_finite on all non-finite array) #25879

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8 changes: 0 additions & 8 deletions lib/matplotlib/axes/_axes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2208,19 +2208,11 @@ def _convert_dx(dx, x0, xconv, convert):
x0 = cbook._safe_first_finite(x0)
except (TypeError, IndexError, KeyError):
pass
except StopIteration:
# this means we found no finite element, fall back to first
# element unconditionally
x0 = cbook.safe_first_element(x0)

try:
x = cbook._safe_first_finite(xconv)
except (TypeError, IndexError, KeyError):
x = xconv
except StopIteration:
# this means we found no finite element, fall back to first
# element unconditionally
x = cbook.safe_first_element(xconv)

delist = False
if not np.iterable(dx):
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10 changes: 5 additions & 5 deletions lib/matplotlib/cbook/__init__.py
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Expand Up @@ -1676,13 +1676,13 @@ def safe_first_element(obj):

def _safe_first_finite(obj, *, skip_nonfinite=True):
"""
Return the first non-None (and optionally finite) element in *obj*.
Return the first finite element in *obj* if one is available and skip_nonfinite is
True. Otherwise return the first element.

This is a method for internal use.

This is a type-independent way of obtaining the first non-None element,
supporting both index access and the iterator protocol.
The first non-None element will be obtained when skip_none is True.
This is a type-independent way of obtaining the first finite element, supporting
both index access and the iterator protocol.
"""
def safe_isfinite(val):
if val is None:
Expand Down Expand Up @@ -1714,7 +1714,7 @@ def safe_isfinite(val):
raise RuntimeError("matplotlib does not "
"support generators as input")
else:
return next(val for val in obj if safe_isfinite(val))
return next((val for val in obj if safe_isfinite(val)), safe_first_element(obj))


def sanitize_sequence(data):
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12 changes: 12 additions & 0 deletions lib/matplotlib/tests/test_cbook.py
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Expand Up @@ -609,6 +609,18 @@ def test_flatiter():
assert 1 == next(it)


def test__safe_first_finite_all_nan():
arr = np.full(2, np.nan)
ret = cbook._safe_first_finite(arr)
assert np.isnan(ret)


def test__safe_first_finite_all_inf():
arr = np.full(2, np.inf)
ret = cbook._safe_first_finite(arr)
assert np.isinf(ret)


def test_reshape2d():

class Dummy:
Expand Down