Code does not work on new version of Matplotlib (original) (raw)

Hello everyone,

I would need a little help on this code that works with matplotlib 3.3.2 but not with matplotlib 3.9.2.

X1 and Y1 are numpy.ndarray

contour=True

plt.figure(figname, figsize=(6,6), dpi=100)
ax = plt.gca()
ax.scatter(X1[::n1], Y1[::n1], marker='.', alpha=0.1, label='XY')
if contour:
        sns.kdeplot(x=X1[::30], y=Y1[::30], color='k', levels=levels, alpha=0.3, ax=ax, linestyles="--")
        contourdata=[]
        for i,c in enumerate(ax.collections):  
            if isinstance(c, matplotlib.collections.LineCollection):
                if len(c.get_segments())>0:
                     v = c.get_segments()[0]
                     cv=centeroidnp(v)
                     ax.plot(list(zip(*v))[0], list(zip(*v))[1], color='k', alpha=0.3, label="Outer Contour", linewidth=2.0)
                     ax.scatter(cv[0], cv[1], color='k', alpha=0.3, label="Contour center")
                     contourdata.append((i, len(v), cv))
                     break

I have two problems:

• isinstance(c, matplotlib.collections.LineCollection) always returns False
• c.get_segments returns an error: ‘QuadContourSet’ object has no attribute ‘get_segments’

What should I do to make it work with the 3.9.2 version of Matplotlib?

Thank you very much for your help

MRAB (Matthew Barnett) May 6, 2025, 4:17pm 2

For Matplotlib-related problems, I’d recommend you visit the Matplotlib forum where there’s this post:

Collections attribute deprecation in version > 3.8 - Community - Matplotlib