How to get as fast as possible a specific sequence of numbers (all numbers twice, except for the first and last) with numpy?
Knowing a final number (for example 5), I would like to create an array containing the following sequence:
How to get fastly as possible a specific sequence of numbers (all numbers twice, except for the first and last) with numpy?
Knowing a final number (for example 5), I would like to create an array containing the following sequence:
Accumulate an array of coefficients based on an array of non unique items in Numpy
I have a numpy.array items of N~10^7 integers and a numpy.array coefficients of N floats.
items contains repeated entries, and only ~sqrt(N) unique entries.