Blurb::
Integer-valued discrete design variables

Description::
A design variable whose values come from a specified set of admissible
integers. See :ref:`variables:usage` for tips on specifying discrete set
variables.

Topics::
discrete_variables, design_variables
Examples::
Four integer variables whose values will be selected from the
following sets during the search for an optimal design. :math:`y1 \in
\{0,1\}` , :math:`y2 \in \{0, 1\}` , :math:`y3 \in \{0,5\}`  and :math:`y4 \in
\{10, 15, 20, 23\}` .


.. code-block::

    discrete_design_set
      integer 4
        descriptors           'y1'  'y2'  'y3'  'y4'
        elements_per_variable 2     2     2     4
        elements              0 1   0 1   0 5   10 15 20 23


Theory::

Faq::

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