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<center><b><big><big>CppAD Speed: Gradient of Ode Solution</big></big></b></center>
<br/>
<b><big><a name="link_ode" id="link_ode">link_ode</a></big></b>
<code><font color='blue'><pre style='display:inline'>
# include <cstring>
# include <cppad/cppad.hpp>
# include <cppad/speed/ode_evaluate.hpp>
# include <cppad/speed/uniform_01.hpp>
# include <cassert>
bool link_ode(
size_t size ,
size_t repeat ,
CppAD::vector<double> &x ,
CppAD::vector<double> &jacobian
)
{ // -------------------------------------------------------------
// setup
typedef CppAD::<a href="ad.xml" target="_top">AD</a><double> ADScalar;
typedef CppAD::vector<ADScalar> ADVector;
typedef CppAD::vector<double> DblVector;
size_t j;
size_t m = 0;
size_t n = size;
assert( x.size() == n );
assert( jacobian.size() == n * n );
ADVector X(n);
ADVector Y(n);
CppAD::<a href="funconstruct.xml" target="_top">ADFun</a><double> F;
static bool printed = false;
bool print_this_time = (! printed) & (repeat > 1) & (size >= 3);
while(repeat--)
{ // choose next x value
uniform_01(n, x);
for(j = 0; j < n; j++)
X[j] = x[j];
// declare the independent variable vector
<a href="independent.xml" target="_top">Independent</a>(X);
// evaluate function
CppAD::ode_evaluate(X, m, Y);
// create function object f : X -> Y
F.Dependent(X, Y);
extern bool global_optimize;
if( global_optimize )
{ size_t before, after;
before = F.size_var();
F.optimize();
if( print_this_time )
{ after = F.size_var();
std::cout << "optimize: size = " << size
<< ": size_var() = "
<< before << "(before) "
<< after << "(after) "
<< std::endl;
printed = true;
print_this_time = false;
}
}
jacobian = F.<a href="jacobian.xml" target="_top">Jacobian</a>(x);
}
return true;
}
</pre></font></code>
<hr/>Input File: speed/cppad/ode.cpp
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