From e7aba708ec6c8d834bc250bafa4e405d2736af38 Mon Sep 17 00:00:00 2001 From: Elliott Sales de Andrade Date: Sat, 3 Aug 2024 05:42:17 -0400 Subject: [PATCH] Backport PR #28649: FIX: improve formatting of image values in cases of singular norms --- lib/matplotlib/artist.py | 4 +++- lib/matplotlib/cbook.py | 4 ++++ lib/matplotlib/tests/test_image.py | 3 ++- 3 files changed, 9 insertions(+), 2 deletions(-) diff --git a/lib/matplotlib/artist.py b/lib/matplotlib/artist.py index d5b8631e95df..735c2eb59cf5 100644 --- a/lib/matplotlib/artist.py +++ b/lib/matplotlib/artist.py @@ -1346,7 +1346,9 @@ def format_cursor_data(self, data): delta = np.diff( self.norm.boundaries[neigh_idx:cur_idx + 2] ).max() - + elif self.norm.vmin == self.norm.vmax: + # singular norms, use delta of 10% of only value + delta = np.abs(self.norm.vmin * .1) else: # Midpoints of neighboring color intervals. neighbors = self.norm.inverse( diff --git a/lib/matplotlib/cbook.py b/lib/matplotlib/cbook.py index a156ac200abf..f5a4199cf9ad 100644 --- a/lib/matplotlib/cbook.py +++ b/lib/matplotlib/cbook.py @@ -2252,6 +2252,10 @@ def _g_sig_digits(value, delta): it is known with an error of *delta*. """ if delta == 0: + if value == 0: + # if both value and delta are 0, np.spacing below returns 5e-324 + # which results in rather silly results + return 3 # delta = 0 may occur when trying to format values over a tiny range; # in that case, replace it by the distance to the closest float. delta = abs(np.spacing(value)) diff --git a/lib/matplotlib/tests/test_image.py b/lib/matplotlib/tests/test_image.py index a043d3aec983..0c032fa5367a 100644 --- a/lib/matplotlib/tests/test_image.py +++ b/lib/matplotlib/tests/test_image.py @@ -411,7 +411,8 @@ def test_cursor_data_nonuniform(xy, data): ([[.123, .987]], "[0.123]"), ([[np.nan, 1, 2]], "[]"), ([[1, 1+1e-15]], "[1.0000000000000000]"), - ([[-1, -1]], "[-1.0000000000000000]"), + ([[-1, -1]], "[-1.0]"), + ([[0, 0]], "[0.00]"), ]) def test_format_cursor_data(data, text): from matplotlib.backend_bases import MouseEvent pFad - Phonifier reborn

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