René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"[Doc]: Frame grabbing docs outdated?","articleBody":"### Documentation Link\r\n\r\nhttps://matplotlib.org/stable/gallery/animation/frame_grabbing_sgskip.html\r\n\r\n### Problem\r\n\r\nAn API part that used to accept scalars now expects a sequence.\r\nRunning:\r\n\r\n``` python\r\n\r\nimport numpy as np\r\n\r\nimport matplotlib\r\n\r\nmatplotlib.use(\"Agg\")\r\nimport matplotlib.pyplot as plt\r\n\r\nfrom matplotlib.animation import FFMpegWriter\r\n\r\n# Fixing random state for reproducibility\r\nnp.random.seed(19680801)\r\n\r\n\r\nmetadata = dict(title='Movie Test', artist='Matplotlib',\r\n                comment='Movie support!')\r\nwriter = FFMpegWriter(fps=15, metadata=metadata)\r\n\r\nfig = plt.figure()\r\nl, = plt.plot([], [], 'k-o')\r\n\r\nplt.xlim(-5, 5)\r\nplt.ylim(-5, 5)\r\n\r\nx0, y0 = 0, 0\r\n\r\nwith writer.saving(fig, \"writer_test.mp4\", 100):\r\n    for i in range(100):\r\n        x0 += 0.1 * np.random.randn()\r\n        y0 += 0.1 * np.random.randn()\r\n        l.set_data(x0, y0)\r\n        writer.grab_frame()\r\n```\r\n\r\nfrom https://matplotlib.org/stable/gallery/animation/frame_grabbing_sgskip.html\r\n\r\nUsed to work, but now it produces:\r\n\r\n``` bash\r\n\r\nRuntimeError                              Traceback (most recent call last)\r\nCell In[1], line 30\r\n     28 x0 += 0.1 * np.random.randn()\r\n     29 y0 += 0.1 * np.random.randn()\r\n---\u003e 30 l.set_data(x0, y0)\r\n     31 writer.grab_frame()\r\n\r\nFile ~/miniconda3/envs/pytorch/lib/python3.12/site-packages/matplotlib/lines.py:665, in Line2D.set_data(self, *args)\r\n    662 else:\r\n    663     x, y = args\r\n--\u003e 665 self.set_xdata(x)\r\n    666 self.set_ydata(y)\r\n\r\nFile ~/miniconda3/envs/pytorch/lib/python3.12/site-packages/matplotlib/lines.py:1289, in Line2D.set_xdata(self, x)\r\n   1276 \"\"\"\r\n   1277 Set the data array for x.\r\n   1278 \r\n   (...)\r\n   1286 set_ydata\r\n   1287 \"\"\"\r\n   1288 if not np.iterable(x):\r\n-\u003e 1289     raise RuntimeError('x must be a sequence')\r\n   1290 self._xorig = copy.copy(x)\r\n   1291 self._invalidx = True\r\n\r\nRuntimeError: x must be a sequence\r\n\r\n```\r\n\r\nWhich was not a problem in some previous versions.\r\n\r\n\r\n\r\n\r\n### Suggested improvement\r\n\r\n* We should update the docs with an example illustrating how people should use the new implementation of `FFMpegWriter` .","author":{"url":"https://github.com/v0lta","@type":"Person","name":"v0lta"},"datePublished":"2024-09-09T13:34:51.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/28794/matplotlib/issues/28794"}