Numpy - Accumulated and Incremental series

In Hydrology, it is always needed to deal with time-series of variables, as flow series or precipitation series, with the variable being incremental or accumulated.

Numpy has a great way to transform between accumulated and incremental series.

To accumulate a incremental series use the method

   numpy.cumsum(incrementalSeries)

And to transform a accumulated array to a incremental one, use:

    numpy.diff(accumulatedSeries)