diff --git a/lib/mpl_toolkits/axes_grid1/inset_locator.py b/lib/mpl_toolkits/axes_grid1/inset_locator.py
index c7bbdd6b185e..ccb9254e5ee4 100644
--- a/lib/mpl_toolkits/axes_grid1/inset_locator.py
+++ b/lib/mpl_toolkits/axes_grid1/inset_locator.py
@@ -6,10 +6,11 @@
from matplotlib import docstring
import six
+import matplotlib.cbook as cbook
from matplotlib.offsetbox import AnchoredOffsetbox
from matplotlib.patches import Patch, Rectangle
from matplotlib.path import Path
-from matplotlib.transforms import Bbox, BboxTransformTo
+from matplotlib.transforms import Bbox, BboxBase, BboxTransformTo
from matplotlib.transforms import IdentityTransform, TransformedBbox
from . import axes_size as Size
@@ -420,11 +421,12 @@ def inset_axes(parent_axes, width, height, loc=1,
'center' : 10
bbox_to_anchor : tuple or `matplotlib.transforms.BboxBase`, optional
- Bbox that the inset axes will be anchored. Can be a tuple of
- [left, bottom, width, height], or a tuple of [left, bottom].
+ Bbox that the inset axes will be anchored. Should be a tuple of
+ [left, bottom, width, height] in axes-relative units.
bbox_transform : `matplotlib.transforms.Transform`, optional
- Transformation for the bbox. if None, `parent_axes.transAxes` is used.
+ Transformation for the bbox. If None, and *bbox_to_anchor* is
+ specified, then `parent_axes.transAxes` is used.
axes_class : `matplotlib.axes.Axes` type, optional
If specified, the inset axes created with be created with this class's
@@ -455,9 +457,17 @@ def inset_axes(parent_axes, width, height, loc=1,
if bbox_to_anchor is None:
bbox_to_anchor = parent_axes.bbox
-
- if bbox_transform is None:
- bbox_transform = parent_axes.transAxes
+ else:
+ if not isinstance(bbox_to_anchor, BboxBase):
+ if len(bbox_to_anchor) < 4:
+ cbook.warn_deprecated('3.0',
+ "bbox_to_anchor should be a tupple "
+ "[left, bottom, width, height]. Using "
+ "[left, bottom, 1-left, 1-bottom].")
+ bbox_to_anchor = [bbox_to_anchor[0], bbox_to_anchor[1],
+ 1 - bbox_to_anchor[0], 1 - bbox_to_anchor[1]]
+ if bbox_transform is None:
+ bbox_transform = parent_axes.transAxes
axes_locator = AnchoredSizeLocator(bbox_to_anchor,
width, height,
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