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// SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
// SPDX-FileCopyrightText: Bradley M. Bell <bradbell@seanet.com>
// SPDX-FileContributor: 2003-22 Bradley M. Bell
// ----------------------------------------------------------------------------
/*
Test the use of the special parameters zero and one with the multiply operator
*/
# include <cppad/cppad.hpp>
typedef CppAD::AD<double> ADdouble;
typedef CppAD::AD< ADdouble > ADDdouble;
bool AddZero(void)
{
using namespace CppAD;
bool ok = true;
size_t i;
for(i = 0; i < 2; i++)
{ // run through the cases x = 0, 1
size_t j;
for(j = 0; j < 2; j++)
{ // run through the cases y = 0, 1
CPPAD_TESTVECTOR( ADdouble ) x(1);
x[0] = double(i);
Independent(x);
CPPAD_TESTVECTOR( ADDdouble ) y(1);
y[0] = ADDdouble(j);
Independent(y);
CPPAD_TESTVECTOR( ADDdouble ) z(2);
z[0] = x[0] + y[0];
z[1] = y[0] + x[0];
z[1] += x[0];
// f(y) = z = { x + y , y + x + x }
ADFun< ADdouble > f(y, z);
CPPAD_TESTVECTOR( ADdouble ) u( f.Domain() );
CPPAD_TESTVECTOR( ADdouble ) v( f.Range() );
// v = f(y)
u[0] = ADdouble(j);
v = f.Forward(0, u);
// check value of f
ok &= v[0] == x[0] + ADdouble(j);
ok &= v[1] == ADdouble(j) + x[0] + x[0];
// g(x) = f(y) = {x + y , y + x + x}
ADFun<double> g(x, v);
CPPAD_TESTVECTOR( double ) a( g.Domain() );
CPPAD_TESTVECTOR( double ) b( g.Range() );
// b = g'(x)
a[0] = 1.;
b = g.Forward(1, a);
// check derivatives of g
ok &= (b[0] == 1.);
ok &= (b[1] == 2.);
}
}
return ok;
}
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