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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
// ----------------------------------------------------------------------------
/*
{xrst_begin graph_atom4_op.cpp}
C++ AD Graph Atomic Four Functions: Example and Test
####################################################
Source Code
***********
{xrst_literal
// BEGIN C++
// END C++
}
{xrst_end graph_atom4_op.cpp}
*/
// BEGIN C++
# include <cppad/cppad.hpp>
namespace {
class atomic_int_pow : public CppAD::atomic_four<double> {
public:
atomic_int_pow(void) : CppAD::atomic_four<double>("int_pow")
{ }
private:
// for_type
bool for_type(
size_t call_id ,
const CppAD::vector<CppAD::ad_type_enum>& type_x ,
CppAD::vector<CppAD::ad_type_enum>& type_y ) override
{ type_y[0] = type_x[0];
return true;
}
// forward
bool forward(
size_t call_id ,
const CppAD::vector<bool>& select_y ,
size_t order_low ,
size_t order_up ,
const CppAD::vector<double>& taylor_x ,
CppAD::vector<double>& taylor_y ) override
{
// order_up
if( order_up != 0 )
return false;
//
// taylor_y
taylor_y[0] = 1.0;
for(size_t i = 0; i < call_id; ++i)
taylor_y[0] *= taylor_x[0];
//
return true;
}
};
}
bool atom4_op(void)
{ bool ok = true;
using std::string;
//
// reciprocal
atomic_int_pow int_pow;
// -----------------------------------------------------------------------
//
// This function has an atomic function operator with name int_pow
// node_1 : p[0]
// node_2 : x[0]
// node_3 : p[0] + x[0]
// node_4 : int_pow( p[0] + x[0] )
// y[0] = ( p[0] + x[0] ) ** call_id
//
// call_id
size_t call_id = 2;
//
// C++ graph object
CppAD::cpp_graph graph_obj;
graph_obj.initialize();
//
// operator being used
CppAD::graph::graph_op_enum op_enum;
//
graph_obj.function_name_set("g(p; x)");
graph_obj.n_dynamic_ind_set(1);
graph_obj.n_variable_ind_set(1);
//
// node_3 : p[0] + x[0]
op_enum = CppAD::graph::add_graph_op;
graph_obj.operator_vec_push_back(op_enum);
graph_obj.operator_arg_push_back(1);
graph_obj.operator_arg_push_back(2);
//
// node_4 : f( p[0] + x[0] )
//
// name_index, n_result, n_arg come before first_node
size_t name_index = graph_obj.atomic_name_vec_size();
graph_obj.atomic_name_vec_push_back("int_pow");
//
op_enum = CppAD::graph::atom4_graph_op;
graph_obj.operator_vec_push_back(op_enum);
graph_obj.operator_arg_push_back(name_index); // name_index
graph_obj.operator_arg_push_back(call_id); // call_id
graph_obj.operator_arg_push_back(1); // n_result
graph_obj.operator_arg_push_back(1); // n_node_arg
graph_obj.operator_arg_push_back(3); // first and last node arg
//
// y[0] = int_pow( p[0] + x[0] ) = ( p[0] + x[0] ) ** call_id
graph_obj.dependent_vec_push_back(4);
// ------------------------------------------------------------------------
CppAD::ADFun<double> g;
g.from_graph(graph_obj);
// ------------------------------------------------------------------------
ok &= g.Domain() == 1;
ok &= g.Range() == 1;
ok &= g.size_dyn_ind() == 1;
//
// set p in g(p; x)
CPPAD_TESTVECTOR(double) p(1);
p[0] = 2.0;
g.new_dynamic(p);
//
// evaluate g(p; x)
CPPAD_TESTVECTOR(double) x(1), y(1);
x[0] = 3.0;
y = g.Forward(0, x);
//
// check value
double eps99 = 99.0 * std::numeric_limits<double>::epsilon();
double check = std::pow( p[0] + x[0], double(call_id) );
ok &= CppAD::NearEqual(y[0], check, eps99, eps99);
// ------------------------------------------------------------------------
g.to_graph(graph_obj);
g.from_graph(graph_obj);
// ------------------------------------------------------------------------
ok &= g.Domain() == 1;
ok &= g.Range() == 1;
ok &= g.size_dyn_ind() == 1;
//
// set p in g(p; x)
p[0] = 4.0;
g.new_dynamic(p);
//
// evaluate g(p; x)
x[0] = 5.0;
y = g.Forward(0, x);
//
// check value
check = std::pow( p[0] + x[0], double(call_id) );
ok &= CppAD::NearEqual(y[0], check, eps99, eps99);
// ------------------------------------------------------------------------
return ok;
}
// END C++
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