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The accumulation interval function creates cumulative series for several intervals. For the first output time step in each interval the output value equals the input value for that time step. For the other time steps for a given other output time step the output value is equal to the sum of the input value for that time step and the previous output value. The intervals are defined by the selected time span or the selected time step. If a time span is selected, then the function uses the time span as the size for the intervals and the first interval starts at the start of the period that is visible in the time series display. If a time step is selected, then the function uses the selected time step to create intervals and each . Each period between two consecutive time steps in the selected time step is an interval.
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