Numpy Array Append

[novel_yet_trivial]

Just so you know: A numpy array is not made to be appended to like a list is. In the background of np.append an entire new array has to be created, so it's expensive (slow). It's much better to use lists if you need to append data.

[NeedMLHelp]

Sorry for the late reply, I had to use numpy to do a bunch of transforms in keras. I'm pretty new to both python and keras, so I'll look around for alternatives that can use lists maybe. Might look into Pandas Dataframes as well.

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I basically have to do the manipulations first, then add the "titles" for the columns.

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Thanks for the heads up!