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Replace mlab functions #9177

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Replace mlab functions #9177

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b4e339a
Replace path_length in contour
dstansby Sep 16, 2017
c1fbf27
Deprecate is_closed_polygon
dstansby Sep 21, 2017
0138524
Replace bivariate normal in testing methods
dstansby Sep 21, 2017
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Replace path_length in contour
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@dstansby
dstansby committed Sep 16, 2017
commit b4e339af4cc20fa9178619697c947f4b9b08b094
8 changes: 5 additions & 3 deletions lib/matplotlib/contour.py
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Expand Up @@ -376,7 +376,7 @@ def calc_label_rot_and_inline(self, slc, ind, lw, lc=None, spacing=5):
not empty (lc defaults to the empty list if None). *spacing*
is the space around the label in pixels to leave empty.

Do both of these tasks at once to avoid calling mlab.path_length
Do both of these tasks at once to avoid calculating path lengths
multiple times, which is relatively costly.

The method used here involves calculating the path length
Expand All @@ -400,8 +400,10 @@ def calc_label_rot_and_inline(self, slc, ind, lw, lc=None, spacing=5):

ind = 0

# Path length in pixel space
pl = mlab.path_length(slc)
# Calculate path lengths
pl = np.zeros(slc.shape[0], dtype=float)
dx = np.diff(slc, axis=0)
pl[1:] = np.cumsum(np.hypot(dx[:, 0], dx[:, 1]))
pl = pl - pl[ind]

# Use linear interpolation to get points around label
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3 changes: 3 additions & 0 deletions lib/matplotlib/mlab.py
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Expand Up @@ -3911,6 +3911,7 @@ def cross_from_above(x, threshold):
##################################################
# Vector and path length geometry calculations
##################################################
@cbook.deprecated('2.2')
def vector_lengths(X, P=2., axis=None):
"""
Finds the length of a set of vectors in *n* dimensions. This is
Expand All @@ -3925,6 +3926,7 @@ def vector_lengths(X, P=2., axis=None):
return (np.sum(X**(P), axis=axis))**(1./P)


@cbook.deprecated('2.2')
def distances_along_curve(X):
"""
Computes the distance between a set of successive points in *N* dimensions.
Expand All @@ -3937,6 +3939,7 @@ def distances_along_curve(X):
return vector_lengths(X, axis=1)


@cbook.deprecated('2.2')
def path_length(X):
"""
Computes the distance travelled along a polygonal curve in *N* dimensions.
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