lines 7-35 of file: example/abs_normal/abs_eval.cpp

{xrst_begin abs_eval.cpp}
{xrst_spell
   affine
}

abs_eval: Example and Test
##########################

Purpose
*******
The function
:math:`f : \B{R}^3 \rightarrow \B{R}` defined by

.. math::

   f( x_0, x_1, x_2  ) = | x_0 + x_1 | + | x_1 + x_2 |

is affine, except for its absolute value terms.
For this case, the abs_normal approximation should be equal
to the function itself.

Source
******
{xrst_literal
   // BEGIN C++
   // END C++
}

{xrst_end abs_eval.cpp}