----------------------------------------------------------------
lines 687-757 of file: include/cppad/example/valvector/class.hpp
----------------------------------------------------------------

   {xrst_begin valvector_unary_math}
   {xrst_spell
      acosh
      asinh
      erfc
      expm
      signum
   }

   The valvector Unary Math Functions
   ##################################

   Syntax
   ******
   | *y* = ``CppAD`` :: *fun* ( *x* )

   x
   *
   The argument *x* is a ``const`` valvector that is passed by reference.

   y
   *
   The result *y* is a valvector with the same size as *x* .

   fun
   ***

   Standard Math Functions
   =======================
   The function name *fun* can be any of the following:
   ``acos``,
   ``acosh``,
   ``asin``,
   ``asinh``,
   ``atan``,
   ``atanh``,
   ``cos``,
   ``cosh``,
   ``erf``,
   ``erfc``,
   ``exp``,
   ``expm1``,
   ``fabs``,
   ``log``,
   ``log1p``,
   ``log10``,
   ``sin``,
   ``sinh``,
   ``sqrt``,
   ``tan``,
   ``tanh``

   abs
   ===
   The function name *fun* can be ``abs`` ,
   which acts the same as the standard function ``fabs`` .

   sign
   ====
   The function name *fun* can be ``sign`` ,
   which computes the sign (or signum) function.

   {xrst_toc_hidden
      example/valvector/unary_math.cpp
   }
   Example
   =======
   The file :ref:`valvector_unary_math.cpp-name` is an example and test of the
   valvector unary math functions.

   {xrst_end valvector_unary_math}