time_diffs = np.diff(df['Time (UTC)']).astype('timedelta64[s]').astype(float)
时间: 2023-06-14 11:02:45 浏览: 35
这段代码的作用是计算一个DataFrame中时间列的时间差,并将其转换成浮点数的形式,单位为秒。具体来说,它使用了NumPy中的diff函数计算时间列的差分,得到的结果是一个timedelta类型的数组。然后,使用astype函数将timedelta类型转换成秒数的浮点数形式。最终,得到的time_diffs数组中存储了时间差的浮点数表示。
相关问题
def calculate_speed(df): time_diffs = np.diff(df['Time (UTC)']).astype('timedelta64[s]').astype(float) positions = df[['Latitude', 'Longitude']].to_numpy() distances = [euclidean(positions[i], positions[i + 1]) for i in range(len(positions) - 1)] speeds = np.array(distances) / time_diffs return np.insert(speeds, 0, 0)
这段代码的作用是计算一个包含时间、纬度和经度信息的数据框(DataFrame)中每个时刻的速度。具体来说,它首先将时间列转换为时间差(即相邻两个时间之间的差值),然后计算相邻两个时刻的位置之间的欧几里得距离,最后将每个时刻的速度(即距离除以时间)存储在一个NumPy数组中,并在数组的开头插入一个零,以保证速度数组的长度与时间和位置数组相同。
git binary diffs are not supported.
This error message usually indicates that you are trying to view a binary file in Git using the "git diff" command. Git is designed to handle text files, and it cannot display differences between binary files in a meaningful way.
To resolve this issue, you can try using a different tool to view the binary file, such as a hex editor or a dedicated diff tool for binary files. Alternatively, you can tell Git to treat the file as a binary file by adding a "binary" attribute to the file's Git attributes file. This will prevent Git from attempting to display diffs for the file.
To add the "binary" attribute to a file, create or edit the .gitattributes file in the root of your repository and add the following line:
```
path/to/binary/file binary
```
Replace "path/to/binary/file" with the path to your binary file. After adding this attribute, Git will treat the file as a binary file and will not attempt to show diffs for it.