# PARTSUM

## Purpose:

Calculates the partial sum of a series.

## Syntax:

PARTSUM(series)

series |
- |
A series or table. |

## Returns:

A series or table.

## Example:

partsum({20, 15, 30, 10, 25})

returns a series containing the cumulative
sums {20, 35, 65, 75, 100}.

## Remarks:

The n^{th}
value of the output series is equal to the sum of the first n
points of the input series:

or by the equivalent difference equation:

PARTSUM calculates the cumulative sum
of a series. PARTSUM differs from integration in that the DELTAX
information is not incorporated into the calculation.

See PARTPROD
to calculate the partial product.

## See Also:

CUMSUM

INTEG

PARTPROD

SUM