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
|
// 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 print_for_string.cpp}
Print During Zero Order Forward Mode: Example and Test
######################################################
{xrst_literal
// BEGIN C++
// END C++
}
{xrst_end print_for_string.cpp}
*/
// BEGIN C++
# include <cppad/cppad.hpp>
namespace {
using std::endl;
using CppAD::AD;
// use of PrintFor to check for invalid function arguments
AD<double> check_log(const AD<double>& u, std::ostream& s_out)
{ // check AD<double> value during recording
if( u <= 0 )
s_out << "check_log: u = " << u << " which is <= 0\n";
// check double value during zero order forward calculation
PrintFor(u, "check_log: u = ", u , " which is <= 0\n");
return log(u);
}
}
bool print_for(void)
{ bool ok = true;
using CppAD::PrintFor;
std::stringstream stream_out;
double eps99 = 99.0 * std::numeric_limits<double>::epsilon();
// independent variable vector
size_t np = 1;
size_t nx = 1;
size_t ny = 1;
CPPAD_TESTVECTOR(AD<double>) ap(np), ax(nx), ay(ny);
ap[0] = 1.0;
ax[0] = 2.0;
Independent(ax, ap);
//
// define f(x, p) = log(p) + log(x)
ay[0] = check_log(ap[0], stream_out) + check_log(ax[0], stream_out);
CppAD::ADFun<double> f(ax, ay);
//
// zero order forward
// both x and p are positive so no output generated
CPPAD_TESTVECTOR(double) p(np), x(nx), y(ny);
p[0] = 1.0;
x[0] = 2.0;
f.new_dynamic(p);
f.check_for_nan(false);
y = f.Forward(0, x, stream_out);
ok &= stream_out.str() == "";
ok &= CppAD::NearEqual(y[0], std::log(p[0]) + std::log(x[0]), eps99, eps99);
//
// zero order forward
// p is negative so output generated
p[0] = -1.0;
x[0] = 2.0;
f.new_dynamic(p);
f.check_for_nan(false);
y = f.Forward(0, x, stream_out);
ok &= stream_out.str() == "check_log: u = -1 which is <= 0\n";
ok &= std::isnan(y[0]);
//
return ok;
}
// END C++
|
