nan: Example and Test

nan.cpp

Headings

@(@\newcommand{\W}[1]{ \; #1 \; } \newcommand{\R}[1]{ {\rm #1} } \newcommand{\B}[1]{ {\bf #1} } \newcommand{\D}[2]{ \frac{\partial #1}{\partial #2} } \newcommand{\DD}[3]{ \frac{\partial^2 #1}{\partial #2 \partial #3} } \newcommand{\Dpow}[2]{ \frac{\partial^{#1}}{\partial {#2}^{#1}} } \newcommand{\dpow}[2]{ \frac{ {\rm d}^{#1}}{{\rm d}\, {#2}^{#1}} }@)@ nan: Example and Test

# include <cppad/utility/nan.hpp>
# include <vector>
# include <limits>

bool nan(void)
{     bool ok = true;

     // get a nan
     double double_zero = 0.;
     double double_nan = std::numeric_limits<double>::quiet_NaN();

     // create a simple vector with no nans
     std::vector<double> v(2);
     v[0] = double_zero;
     v[1] = double_zero;

     // check that zero is not nan
     ok &= ! CppAD::isnan(double_zero);
     ok &= ! CppAD::hasnan(v);

     // check that nan is a nan
     v[1] = double_nan;
     ok &= CppAD::isnan(double_nan);
     ok &= CppAD::hasnan(v);

     // check that nan is not equal to itself
     ok &= (double_nan != double_nan);

     return ok;
}

Input File: example/utility/nan.cpp