1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
// 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_pow_op.cpp}
C++ AD Graph pow Operator: Example and Test
###########################################
Source Code
***********
{xrst_literal
// BEGIN C++
// END C++
}
{xrst_end graph_pow_op.cpp}
*/
// BEGIN C++
# include <cppad/cppad.hpp>
bool pow_op(void)
{ bool ok = true;
using std::string;
double eps99 = 99.0 * std::numeric_limits<double>::epsilon();
//
// AD graph example
// node_1 : p[0]
// node_2 : p[1]
// node_3 : x[0]
// node_4 : pow(p[0] , p[1])
// node_5 : pow(x[0] , p[1])
// y[0] = pow(p[0] , p[1])
// y[1] = pow(x[0] , p[1])
//
// C++ graph object
CppAD::cpp_graph graph_obj;
//
// operator being used
CppAD::graph::graph_op_enum op_enum;
//
// set scalars
graph_obj.function_name_set("pow_op example");
size_t n_dynamic_ind = 2;
graph_obj.n_dynamic_ind_set(n_dynamic_ind);
size_t n_variable_ind = 1;
graph_obj.n_variable_ind_set(n_variable_ind);
//
// node_4 : pow(p[0], p[1])
op_enum = CppAD::graph::pow_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_5 : pow(x[0], p[1])
graph_obj.operator_vec_push_back(op_enum);
graph_obj.operator_arg_push_back(3);
graph_obj.operator_arg_push_back(2);
//
// y[0] = pow(p[0], p[1])
// y[1] = pow(x[0], x[1])
graph_obj.dependent_vec_push_back(4);
graph_obj.dependent_vec_push_back(5);
//
// f(x, p) = y
CppAD::ADFun<double> f;
f.from_graph(graph_obj);
ok &= f.Domain() == 1;
ok &= f.Range() == 2;
ok &= f.size_dyn_ind() == 2;
//
// set independent variables and parameters
CPPAD_TESTVECTOR(double) p(2), x(1);
p[0] = 2.0;
p[1] = 3.0;
x[0] = 4.0;
//
// compute y = f(x, p)
f.new_dynamic(p);
CPPAD_TESTVECTOR(double) y = f.Forward(0, x);
//
// check result
ok &= CppAD::NearEqual(y[0], pow(p[0], p[1]), eps99, eps99);
ok &= CppAD::NearEqual(y[1], pow(x[0], p[1]), eps99, eps99);
// -----------------------------------------------------------------------
// Convert function to graph and back again
f.to_graph(graph_obj);
f.from_graph(graph_obj);
// -----------------------------------------------------------------------
ok &= f.Domain() == 1;
ok &= f.Range() == 2;
ok &= f.size_dyn_ind() == 2;
//
// set independent variables and parameters
p[0] = 3.0;
p[1] = 4.0;
x[0] = 5.0;
//
// compute y = f(x, p)
f.new_dynamic(p);
y = f.Forward(0, x);
//
// check result
ok &= CppAD::NearEqual(y[0], pow(p[0], p[1]), eps99, eps99);
ok &= CppAD::NearEqual(y[1], pow(x[0], p[1]), eps99, eps99);
//
return ok;
}
// END C++
|
