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Backport PR #23390 on branch v3.6.x (FIX: colorbar contour with log norm should default to log locator and formatter...) #24939

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merged 1 commit into from Jan 11, 2023
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Backport PR #23390 on branch v3.6.x (FIX: colorbar contour with log norm should default to log locator and formatter...) #24939

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6 changes: 5 additions & 1 deletion lib/matplotlib/colorbar.py
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Expand Up @@ -1167,7 +1167,11 @@ def _reset_locator_formatter_scale(self):
self._minorlocator = None
self._formatter = None
self._minorformatter = None
if (self.boundaries is not None or
if (isinstance(self.mappable, contour.ContourSet) and
isinstance(self.norm, colors.LogNorm)):
# if contours have lognorm, give them a log scale...
self._set_scale('log')
elif (self.boundaries is not None or
isinstance(self.norm, colors.BoundaryNorm)):
if self.spacing == 'uniform':
funcs = (self._forward_boundaries, self._inverse_boundaries)
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