.. highlightlang:: us

.. index:: cumsum

.. _cumsum:

cumsum
======

.. us.tag  cumsum ENGLISH math-base

:ref:`cumsum` returns the cumulative sums of each column of a matrix.

.. function::  rmCumsum = cumsum(rmMat)

.. us.return

**Return Value**

*rmCumsum* is a real matrix with cumulative sums.

.. us.params

**Parameters**

.. uparam:: r

   *r* is a real matrix.

.. us.example

**Example**

::

   a = [1,2,3;
        4,5,6;
        7,8,9]
   cumsum(a)
   1   2   3
   5   7   9
   12  15  18

.. seealso::
   :ref:`overview-mathematic`,
   :ref:`diff`

:sub:`id-370529`