Not clear how to write a file

[Svito-zar]

The documentation shows the following usage example for the write functionality:

import c3d
import numpy as np


writer = c3d.Writer()
for _ in range(100):
    writer.add_frame(np.random.randn(30, 5))
with open('random-points.c3d', 'wb') as h:
    writer.write(h)

This has two issues. First, it should be add_frames but not add_frame. That's easy to fix. But the second issue is hard to fix, since write.write expects a second argument, labels, and it is not clear what it should be

TypeError: write() missing 1 required positional argument: 'labels'

[mrrezaie]

Hi, I have a similar problem with c3d.Writer. Any idea how to fix it?

for i, point, analog in reader.read_frames():
    writer.add_frames((point,analog))

Traceback (most recent call last):
  File F:\Python310\lib\site-packages\numpy\core\fromnumeric.py:2022 in shape
    result = a.shape
AttributeError: 'list' object has no attribute 'shape'

During handling of the above exception, another exception occurred:
Traceback (most recent call last):
  Cell In[122], line 2
    writer.add_frames((point,analog))
  File F:\Python310\lib\site-packages\c3d\c3d.py:2213 in add_frames
    sh = np.shape(frames)
  File F:\Python310\lib\site-packages\numpy\core\fromnumeric.py:2024 in shape
    result = asarray(a).shape
ValueError: setting an array element with a sequence. The requested array has an inhomogeneous shape after 2 dimensions. The detected shape was (1, 2) + inhomogeneous part.

Any help is greatly appreciated.
Python 3.10, Numpy 1.25

[zhuyuhang4]

@mrrezaie Try to 'pip install numpy==1.21.1'?