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Remove and add values to ​numpy array

Is there a more efficient way to remove the 0 from the beginning and insert the 20 at the end and retain the shape (1, 20)? Output: Answer You can just select a subset of the current array excluding the first element and then add 20 or whatever scalar you want at the end.

Connect 3D points in matplotlib scatter

I have the following code, that generates a 3D scatter plot: What I’m trying to do is connect those 2 points using a directional arrow. What I’ve got What I want: What i want Tried ax.annotation but it doesn’t work. Any suggestions? Preferencially, a for loop to annotate N points, considerin…

Appending new value to the dataframe

Above code prints same value twice i.e. Why is it not appending NSEI at the end of the stocksList dataframe? Full code: Answer how your code is flawed Relying on the length of the index on a dataframe with a reworked index is not reliable. Here is a simple example demonstrating how it can fail. input: Pre-pro…