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{xrst_begin switch_var_dyn.cpp}

Switching Between Variables and Dynamic Parameters: Example and Test
####################################################################

Function
********
For each :ref:`ADFun-name` object there is a corresponding function
:math:`f(x, p)` where
:ref:`independent@x` is the vector of independent variables
and *p* is the vector of
independent :ref:`Independent@dynamic` parameters.

Convert a Function to a Graph
*****************************
The :ref:`to_graph-name` routine can be used to convert a ``ADFun``
to a graph representation; see :ref:`cpp_ad_graph-name` .

Convert a Graph to a Function
*****************************
The :ref:`from_graph-name` routine can be used to convert a graph back
to a function. During this conversion, it is possible to change
dynamic parameters to variables and variables to dynamic parameters;
see :ref:`from_graph@dyn2var` and *var2dyn* in the
``from_graph`` documentation.
Note that many such conversions can be done
using the same ``cpp_ad_graph`` object.

Source Code
***********
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{xrst_end switch_var_dyn.cpp}