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/*
* Newton-Kantorovich iterative solver for nonlinear PDE systems
* Copyright (C) 2017 Anton Khirnov <anton@khirnov.net>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef TEUKOLSKY_DATA_NLSOLVE_H
#define TEUKOLSKY_DATA_NLSOLVE_H
#include <threadpool.h>
#include "basis.h"
#include "log.h"
#include "pssolve.h"
typedef struct NLSolvePriv NLSolvePriv;
typedef struct NLSolveContext {
/**
* Solver private data, not to be touched by the caller.
*/
NLSolvePriv *priv;
/**
* The logging context.
* Set by the caller before tdi_nlsolve_context_init().
*/
TDLogger logger;
/**
* The thread pool used for multithreaded execution. May be set by the
* caller before tdi_nlsolve_context_init(), otherwise a single thread will
* be used.
*/
TPContext *tp;
/**
* Number of equations/unknown functions in the set.
* Set by tdi_nlsolve_context_alloc().
*/
unsigned int nb_equations;
/**
* The basis sets.
*
* basis[i][j] is the basis set used for i-th variable in j-th direction.
*
* The array is allocated by tdi_nlsolve_context_alloc(), must be filled
* by the caller before tdi_nlsolve_context_init().
*/
const BasisSetContext *(*basis)[2];
/**
* Order of the solver.
*
* solve_order[i][j] is the order of the solver (i.e. the number of the
* basis functions used) for i-th variable in j-th direction.
*
* Allocated by tdi_nlsolve_context_alloc(), must be filled by the caller
* before tdi_nlsolve_context_init().
*/
unsigned int (*solve_order)[2];
/**
* Locations of the collocation points. The equation coefficients in NLEqCallback and
* NLEqJacobianCallback should be evaluated at those grid positions.
*
* colloc_grid[i][j] is an array of length solve_order[i][j] and contains
* the collocation points for the i-th equation in the j-th direction.
*
* Set by the solver after tdi_nlsolve_context_init().
*/
const double * const (*colloc_grid)[2];
// solver parameters
unsigned int maxiter;
double atol;
} NLSolveContext;
typedef int (*NLEqCallback)(
void *opaque, unsigned int eq_idx,
const unsigned int *colloc_grid_order, const double * const *colloc_grid,
const double * const (*vars)[PSSOLVE_DIFF_ORDER_NB], double *dst);
typedef int (*NLEqJacobianCallback)(
void *opaque, unsigned int eq_idx,
unsigned int var_idx, enum PSSolveDiffOrder diff_order,
const unsigned int *colloc_grid_order, const double * const *colloc_grid,
const double * const (*vars)[PSSOLVE_DIFF_ORDER_NB], double *dst);
int tdi_nlsolve_context_alloc(NLSolveContext **ctx, unsigned int nb_equations);
int tdi_nlsolve_context_init(NLSolveContext *ctx);
void tdi_nlsolve_context_free(NLSolveContext **ctx);
int tdi_nlsolve_solve(NLSolveContext *ctx, NLEqCallback eq_eval,
NLEqJacobianCallback eq_jac_eval,
void *opaque, double *coeffs, int fast_abort);
void tdi_nlsolve_print_stats(NLSolveContext *ctx);
#endif // TEUKOLSKY_DATA_NLSOLVE_H
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