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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 json_pow_op.cpp}
Json pow Operator: Example and Test
###################################
Source Code
***********
{xrst_literal
// BEGIN C++
// END C++
}
{xrst_end json_pow_op.cpp}
*/
// BEGIN C++
# include <cppad/cppad.hpp>
bool pow_op(void)
{ bool ok = true;
using CppAD::vector;
using CppAD::AD;
using CppAD::NearEqual;
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(p[0], x[0])
// node_6 = pow(p[0], p[1]) + pow(p[0], x[0])
// y[0] = pow(p[0], p[1]) + pow(p[0], x[0])
// use single quote to avoid having to escape double quote
std::string json =
"{\n"
" 'function_name' : 'pow_op example',\n"
" 'op_define_vec' : [ 2, [\n"
" { 'op_code':1, 'name':'add', 'n_arg':2 } ,\n"
" { 'op_code':2, 'name':'pow', 'n_arg':2 } ]\n"
" ],\n"
" 'n_dynamic_ind' : 2,\n"
" 'n_variable_ind' : 1,\n"
" 'constant_vec' : [ 0, [ ] ],\n"
" 'op_usage_vec' : [ 3, [\n"
" [ 2, 1, 2 ] ,\n" // pow(p[0], p[1])
" [ 2, 1, 3 ] ,\n" // pow(p[0], x[0])
" [ 1, 4, 5 ] ]\n" // pow(p[0], p[1]) + pow(p[0], x[0])
" ],\n"
" 'dependent_vec' : [ 1, [6] ] \n"
"}\n";
// Convert the single quote to double quote
for(size_t i = 0; i < json.size(); ++i)
if( json[i] == '\'' ) json[i] = '"';
//
// f(x, p) = pow(p_0, p_1) + pow(p_0, x_0)
CppAD::ADFun<double> f;
f.from_json(json);
//
ok &= f.Domain() == 1;
ok &= f.Range() == 1;
ok &= f.size_dyn_ind() == 2;
//
// set independent variables and parameters
vector<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);
vector<double> y = f.Forward(0, x);
//
// check result
double check_y0 = std::pow(p[0], p[1]) + std::pow(p[0], x[0]);
ok &= NearEqual(y[0], check_y0, eps99, eps99);
// -----------------------------------------------------------------------
// Convert to Json graph and back again
json = f.to_json();
// std::cout << "json = " << json;
f.from_json(json);
// -----------------------------------------------------------------------
ok &= f.Domain() == 1;
ok &= f.Range() == 1;
ok &= f.size_dyn_ind() == 2;
//
// set independent variables and parameters
p[0] = 2.0;
p[1] = 3.0;
x[0] = 4.0;
//
// compute y = f(x, p)
f.new_dynamic(p);
y = f.Forward(0, x);
//
// check result
ok &= NearEqual(y[0], check_y0, eps99, eps99);
//
return ok;
}
// END C++
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