.. highlightlang:: us

.. _diff:

diff
====

.. index:: diff

.. us.tag  diff ENGLISH math-base

:ref:`diff` computes differences such as the
following: [x[2] - x[1], x[3] - x[2], ... , x[n] - x[n-1]]

.. function::  rmDiff = diff(rmMat)

.. us.return

**Return Value**

*rmDiff* is a difference matrix or a vector.

.. us.params

**Parameters**

.. uparam:: r

   *rmMat* is a real matrix or a vector.

.. us.example

**Example**

::

   * a = [1,2,5,4,5,6]
   * diff(a)
      1 3 -1 1 1

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

:sub:`id-273623`