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Cumulative Stats Along a Series

advanced~12 min30 pts
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Problem

Given a 1D numpy array values of length N, compute three series and stack them into a 2D array of shape (N, 3):

  • Column 0: running sum (cumsum)
  • Column 1: running mean (cumsum / [1, 2, 3, ...])
  • Column 2: running max (numpy has np.maximum.accumulate)

Round to 4 decimals. Use np.column_stack or np.stack(axis=1) to assemble.

numpyVectorizationcumsumCumulativeStack
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Python Editor

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