/usr/include/einspline/nugrid.h is in libeinspline-dev 0.9.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// einspline: a library for creating and evaluating B-splines //
// Copyright (C) 2007 Kenneth P. Esler, Jr. //
// //
// 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, write to the Free Software //
// Foundation, Inc., 51 Franklin Street, Fifth Floor, //
// Boston, MA 02110-1301 USA //
/////////////////////////////////////////////////////////////////////////////
#ifndef NUGRID_H
#define NUGRID_H
#include <stdbool.h>
typedef enum { LINEAR, GENERAL, CENTER, LOG } grid_type;
// Nonuniform grid base structure
typedef struct
{
// public data
grid_type code;
double start, end;
double* restrict points;
int num_points;
int (*reverse_map)(void *grid, double x);
} NUgrid;
#ifdef __cplusplus
extern "C"
#endif
typedef struct
{
// public data
grid_type code;
double start, end;
double* restrict points;
int num_points;
int (*reverse_map)(void *grid, double x);
// private data
double a, aInv, b, bInv, center, even_half;
int half_points, odd_one;
bool odd;
} center_grid;
typedef struct
{
// public data
grid_type code;
double start, end;
double* restrict points;
int num_points;
int (*reverse_map)(void *grid, double x);
// private data
double a, ainv, startinv;
} log_grid;
#ifdef __cplusplus
extern "C" {
#endif
NUgrid*
create_center_grid (double start, double end, double ratio,
int num_points);
NUgrid*
create_log_grid (double start, double end, int num_points);
NUgrid*
create_general_grid (double *points, int num_points);
void
destroy_grid (NUgrid *grid);
#ifdef __cplusplus
}
#endif
#endif
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