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32.3 Initializing the Solver
- Function: gsl_root_fsolver * gsl_root_fsolver_alloc (const gsl_root_fsolver_type * T)
This function returns a pointer to a newly allocated instance of a solver of type T. For example, the following code creates an instance of a bisection solver,
const gsl_root_fsolver_type * T = gsl_root_fsolver_bisection; gsl_root_fsolver * s = gsl_root_fsolver_alloc (T);
If there is insufficient memory to create the solver then the function returns a null pointer and the error handler is invoked with an error code of
GSL_ENOMEM
.
- Function: gsl_root_fdfsolver * gsl_root_fdfsolver_alloc (const gsl_root_fdfsolver_type * T)
This function returns a pointer to a newly allocated instance of a derivative-based solver of type T. For example, the following code creates an instance of a Newton-Raphson solver,
const gsl_root_fdfsolver_type * T = gsl_root_fdfsolver_newton; gsl_root_fdfsolver * s = gsl_root_fdfsolver_alloc (T);
If there is insufficient memory to create the solver then the function returns a null pointer and the error handler is invoked with an error code of
GSL_ENOMEM
.
- Function: int gsl_root_fsolver_set (gsl_root_fsolver * s, gsl_function * f, double x_lower, double x_upper)
This function initializes, or reinitializes, an existing solver s to use the function f and the initial search interval [x_lower, x_upper].
- Function: int gsl_root_fdfsolver_set (gsl_root_fdfsolver * s, gsl_function_fdf * fdf, double root)
This function initializes, or reinitializes, an existing solver s to use the function and derivative fdf and the initial guess root.
- Function: void gsl_root_fsolver_free (gsl_root_fsolver * s)
- Function: void gsl_root_fdfsolver_free (gsl_root_fdfsolver * s)
These functions free all the memory associated with the solver s.
- Function: const char * gsl_root_fsolver_name (const gsl_root_fsolver * s)
- Function: const char * gsl_root_fdfsolver_name (const gsl_root_fdfsolver * s)
These functions return a pointer to the name of the solver. For example,
printf ("s is a '%s' solver\n", gsl_root_fsolver_name (s));
would print something like
s is a 'bisection' solver
.
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