@(@\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}} }@)@
This is cppad-20221105 documentation. Here is a link to its
current documentation
.
Convert From AD to its Base Type: Example and Test
# include <cppad/cppad.hpp>
bool Value(void)
{ bool ok = true;
using CppAD::AD;
using CppAD::Value;
// domain space vector
size_t n = 2;
CPPAD_TESTVECTOR(AD<double>) x(n);
x[0] = 3.;
x[1] = 4.;
// check value before recording
ok &= (Value(x[0]) == 3.);
ok &= (Value(x[1]) == 4.);
// declare independent variables and start tape recording
CppAD::Independent(x);
// range space vector
size_t m = 1;
CPPAD_TESTVECTOR(AD<double>) y(m);
y[0] = - x[1];
// cannot call Value(x[j]) or Value(y[0]) here (currently variables)
AD<double> p = 5.; // p is a parameter (does not depend on x)
ok &= (Value(p) == 5.);
// create f: x -> y and stop tape recording
CppAD::ADFun<double> f(x, y);
// can call Value(x[j]) or Value(y[0]) here (currently parameters)
ok &= (Value(x[0]) == 3.);
ok &= (Value(x[1]) == 4.);
ok &= (Value(y[0]) == -4.);
return ok;
}
