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Update plot.py #514

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Update plot.py #514

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12cc01c
Update plot.py
kiasar Aug 25, 2023
aad1cdd
Merge branch 'master' into patch-1
rflamary Sep 6, 2023
0af0df2
Merge branch 'master' into patch-1
rflamary Sep 22, 2023
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21 changes: 17 additions & 4 deletions ot/plot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -60,13 +60,12 @@ def plot1D_mat(a, b, M, title=''):
pl.subplots_adjust(wspace=0., hspace=0.2)


def plot2D_samples_mat(xs, xt, G, thr=1e-8, **kwargs):
def plot2D_samples_mat(xs, xt, G, draw_arrows: bool = True, thr=1e-8, **kwargs):
r""" Plot matrix :math:`\mathbf{G}` in 2D with lines using alpha values

Plot lines between source and target 2D samples with a color
proportional to the value of the matrix :math:`\mathbf{G}` between samples.


Parameters
----------
xs : ndarray, shape (ns,2)
Expand All @@ -75,6 +74,8 @@ def plot2D_samples_mat(xs, xt, G, thr=1e-8, **kwargs):
Target samples positions
G : ndarray, shape (na,nb)
OT matrix
draw_arrows : bool, optional
If True, draw directional arrows in the middle of the lines
thr : float, optional
threshold above which the line is drawn
**kwargs : dict
Expand All @@ -93,5 +94,17 @@ def plot2D_samples_mat(xs, xt, G, thr=1e-8, **kwargs):
for i in range(xs.shape[0]):
for j in range(xt.shape[0]):
if G[i, j] / mx > thr:
pl.plot([xs[i, 0], xt[j, 0]], [xs[i, 1], xt[j, 1]],
alpha=G[i, j] / mx * scale, **kwargs)
plt.plot([xs[i, 0], xt[j, 0]], [xs[i, 1], xt[j, 1]],
alpha=G[i, j] / mx * scale, **kwargs)

if draw_arrows:
# Calculate the midpoint
mid_x = (xs[i, 0] + xt[j, 0]) / 2
mid_y = (xs[i, 1] + xt[j, 1]) / 2

# Annotate with an arrowhead at the midpoint
plt.annotate('',
xy=(mid_x, mid_y),
xytext=(mid_x - 0.5 * (xt[j, 0] - xs[i, 0]), mid_y - 0.5 * (xt[j, 1] - xs[i, 1])),
arrowprops=dict(arrowstyle='-|>', color=kwargs['color'], alpha=G[i, j] / mx * scale)
)
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