incomplete data in mpl_toolkits.mplot3d.art3d.Path3DCollection

[nschloe]

After creating a mpl_toolkits.mplot3d.art3d.Path3DCollection, e.g.,

from matplotlib import pyplot as plt
from mpl_toolkits.mplot3d.art3d import Path3DCollection
import numpy as np

pos = np.random.rand(3, 6)
print(pos.T)
fig = plt.figure()
ax = fig.add_subplot(projection='3d')
ax.scatter(pos[0], pos[1], pos[2], c=np.arange(pos.shape[1]))

I'd like to retrieve pos from the figure. As in 2D, I expected get_offsets to retrieve the data, but

for c in ax.get_children():
    if isinstance(c, Path3DCollection):
        print(c.get_offsets())

only returns the first two colums of pos.

[WeatherGod]

The problem is that these methods are used by the backends, which all
expect 2D data, so it can't return 3D data. Perhaps a get_3doffsets()
method should be created?

On Sun, Oct 9, 2016 at 6:37 PM, Nico Schlömer notifications@github.com
wrote:

After creating a mpl_toolkits.mplot3d.art3d.Path3DCollection, e.g.,

from matplotlib import pyplot as pltfrom mpl_toolkits.mplot3d import Axes3Dfrom mpl_toolkits.mplot3d.art3d import Path3DCollectionimport numpy as np

pos = np.random.rand(3, 6)print(pos)
fig = plt.figure()
ax = plt.gca(projection='3d')
ax.scatter(pos[0], pos[1], pos[2], c=np.arange(pos.shape[1]))

I'd like to retrieve pos from the figure. As in 2D, I expected get_offsets
to retrieve the data, but

for c in ax.get_children():
if isinstance(c, Path3DCollection):
print
print(c.get_offsets())

only returns the first two colums of pos.

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[nschloe]

If there is no other method for extracting the data, I'd vote for it.

[nschloe]

Any chance of this happening?

[WeatherGod]

Anything is possible. It is just a question of someone putting their mind to implementing it. What if we came up with a name for a method that would act as the "get_data()" for any artist? So, for 2D path collections, it would be get_offsets(), for images, it would be the image data, for 3d paths, it would be the untransformed 3d offsets? (note, get_data() is already taken). This is a MEP-worthy task, and once a MEP is made, it makes it much more likely it'll get implemented.

…

On Fri, May 26, 2017 at 9:15 AM, Nico Schlömer ***@***.***> wrote: Any chance of this happening? — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7243 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-OiU8-pJfDTMND3lqeMEXIlFUXg9ks5r9tB9gaJpZM4KSIqR> .

[nschloe]

What does MEP mean?

I like the idea of a unifying get_data method. Perhaps get_raw_data would be appropriate.

[WeatherGod]

MEP == "Matplotlib Enhancement Proposal" http://matplotlib.org/devel/MEP/index.html

…

On Fri, Jun 2, 2017 at 6:15 PM, Nico Schlömer ***@***.***> wrote: What does MEP mean? I like the idea of a unifying get_data method. Perhaps get_raw_data would be appropriate. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#7243 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AARy-CpuCsRmnh8AdT-oUXKlixJSsjRWks5sAIl6gaJpZM4KSIqR> .

[cherry-ball]

I have the same problem and I want to know how to achieve it eventually? Would you please tell me? Thank you very much