seqa, seqm
==============================================

Purpose
----------------
:func:`seqa` creates an additive sequence. :func:`seqm` creates a multiplicative
sequence.

Format
----------------
.. function:: y = seqa(start, inc, n)
              y = seqm(start, inc, n)

    :param start: specifying the first element
    :type start: scalar

    :param inc: specifying increment
    :type inc: scalar

    :param n: specifying the number of elements in the sequence
    :type n: scalar

    :return y: containing the specified sequence.

    :rtype y: nx1 vector

Examples
----------------

::

    a = seqa(2, 2, 10)';
    print a;

::

    2 4 6 8 10 12 14 16 18 20

::

    m = seqm(2, 2, 10)';
    print m;

::

    2 4 8 16 32 64 128 512 1024

Note that the results have been transposed in this example. Both functions return Nx1 (column) vectors.

Remarks
-------

For :func:`seqa`, *y* will contain a first element equal to *start*, the second
equal to :math:`start + inc`, and the last equal to :math:`start + inc*(n-1)`.

For instance,

::

    seqa(1, 1, 10);

will create a column vector containing the numbers ``1, 2, ..., 10``.

For :func:`seqm`, *y* will contain a first element equal to *start*, the second
equal to :math:`start * inc`, and the last equal to :math:`start * inc^n-1`.


For instance,

::

   seqm(10, 10, 10);

will create a column vector containing the numbers ``10, 100,..., `10^10```.

.. seealso:: Functions :func:`recserar`, :func:`recsercp`