/*
   igraph library.
   Copyright (C) 2013-2025  The igraph development team <igraph@igraph.org>

   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 2 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 <https://www.gnu.org/licenses/>.
*/

#ifndef IGRAPH_EMBEDDING_H
#define IGRAPH_EMBEDDING_H

#include "igraph_decls.h"
#include "igraph_datatype.h"
#include "igraph_error.h"
#include "igraph_arpack.h"
#include "igraph_eigen.h"

IGRAPH_BEGIN_C_DECLS

IGRAPH_EXPORT igraph_error_t igraph_adjacency_spectral_embedding(const igraph_t *graph,
                                                      igraph_int_t no,
                                                      const igraph_vector_t *weights,
                                                      igraph_eigen_which_position_t which,
                                                      igraph_bool_t scaled,
                                                      igraph_matrix_t *X,
                                                      igraph_matrix_t *Y,
                                                      igraph_vector_t *D,
                                                      const igraph_vector_t *cvec,
                                                      igraph_arpack_options_t *options);

typedef enum {
    IGRAPH_EMBEDDING_D_A = 0,
    IGRAPH_EMBEDDING_I_DAD,
    IGRAPH_EMBEDDING_DAD,
    IGRAPH_EMBEDDING_OAP
} igraph_laplacian_spectral_embedding_type_t;

IGRAPH_EXPORT igraph_error_t igraph_laplacian_spectral_embedding(const igraph_t *graph,
                                                      igraph_int_t no,
                                                      const igraph_vector_t *weights,
                                                      igraph_eigen_which_position_t which,
                                                      igraph_laplacian_spectral_embedding_type_t type,
                                                      igraph_bool_t scaled,
                                                      igraph_matrix_t *X,
                                                      igraph_matrix_t *Y,
                                                      igraph_vector_t *D,
                                                      igraph_arpack_options_t *options);

IGRAPH_EXPORT igraph_error_t igraph_dim_select(const igraph_vector_t *sv, igraph_int_t *dim);

IGRAPH_END_C_DECLS

#endif