System - PUBLIC METHODS
System is an abstract class.
Therefore, it cannot be
instantiated. Users must derive a class from this one, providing at least
the protected method
EvaluateSystem.
A list of the protected data members
that can be exploited for developing
a user-defined class is available.
System();
Default construction is not allowed and terminates the program.
System
(double step, int species, int rates, int input_species,
int output_rate);
Allocates memory for the concentrations, their time derivatives, the
rates, the input fluxes (in principle, as many as concentrations) and
the
steady state
concentrations. The integration step must be shorter
than the time increment used
in Susceptibility,
Signal and
Response.
Otherwise, the first time the Functional
is used the program terminates. The details of the
system must be
provided by the user in a
class derived from this one.
Parameters
|
step
|
Time increment used for integration
|
|
species
|
Number of species or concentrations
|
|
rates
|
Number of velocities, including output fluxes
|
|
input_species
|
Number of the species that receives the input flux
|
|
output_rate
|
Number of the rate to be considered the response of the system
|
virtual ~System();
Unallocates the memory of all the concentrations, rates, fluxes, et
cetera. The
user-defined system
need not worry about this.
void Functional (const DER &derivative_data);
Integrates the differential equations provided in
a user-defined system. The time
increment dt
must be equal or longer than the
increment used for integration. The functional is evaluated
for pert
instantaneous variations of the concentration
at perttimes
times. The values of the variations are given
by x, which is
the point where an evaluation is needed for calculating an approximate
derivative. The result is returned in the
vector integ.
This method
uses EvaluateSystem
and IntegrateOneStep.
A simple Euler algorithm is provided for the latter, but the former is
expected to be completely defined by the user.
Parameters
|
derivative_data
|
A structure of type DER. Its members are:
|
|
