/usr/include/einspline/nubspline_create.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 NUBSPLINE_CREATE_H
#define NUBSPLINE_CREATE_H
#include "nubspline_structs.h"
#ifdef __cplusplus
extern "C" {
#endif
NUgrid*
create_center_grid (double start, double end, double ratio, int num_points);
NUgrid*
create_general_grid (double *points, int num_points);
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
//// Nonuniform spline creation routines ////
////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////
////////////////////////////////////////
// Nonuniform, single precision, real //
////////////////////////////////////////
NUBspline_1d_s *
create_NUBspline_1d_s (NUgrid* x_grid, BCtype_s xBC, float *data);
NUBspline_2d_s *
create_NUBspline_2d_s (NUgrid* x_grid, NUgrid* y_grid,
BCtype_s xBC, BCtype_s yBC, float *data);
NUBspline_3d_s *
create_NUBspline_3d_s (NUgrid* x_grid, NUgrid* y_grid, NUgrid* z_grid,
BCtype_s xBC, BCtype_s yBC, BCtype_s zBC, float *data);
////////////////////////////////////////
// Nonuniform, double precision, real //
////////////////////////////////////////
NUBspline_1d_d *
create_NUBspline_1d_d (NUgrid* x_grid, BCtype_d xBC, double *data);
NUBspline_2d_d *
create_NUBspline_2d_d (NUgrid* x_grid, NUgrid* y_grid,
BCtype_d xBC, BCtype_d yBC, double *data);
NUBspline_3d_d *
create_NUBspline_3d_d (NUgrid* x_grid, NUgrid* y_grid, NUgrid* z_grid,
BCtype_d xBC, BCtype_d yBC, BCtype_d zBC, double *data);
///////////////////////////////////////////
// Nonuniform, single precision, complex //
///////////////////////////////////////////
NUBspline_1d_c *
create_NUBspline_1d_c (NUgrid* x_grid, BCtype_c xBC,
complex_float *data);
NUBspline_2d_c *
create_NUBspline_2d_c (NUgrid* x_grid, NUgrid* y_grid,
BCtype_c xBC, BCtype_c yBC, complex_float *data);
NUBspline_3d_c *
create_NUBspline_3d_c (NUgrid* x_grid, NUgrid* y_grid, NUgrid* z_grid,
BCtype_c xBC, BCtype_c yBC, BCtype_c zBC,
complex_float *data);
///////////////////////////////////////////
// Nonuniform, double precision, complex //
///////////////////////////////////////////
NUBspline_1d_z *
create_NUBspline_1d_z (NUgrid* x_grid, BCtype_z xBC,
complex_double *data);
NUBspline_2d_z *
create_NUBspline_2d_z (NUgrid* x_grid, NUgrid* restrict y_grid,
BCtype_z xBC, BCtype_z yBC, complex_double *data);
NUBspline_3d_z *
create_NUBspline_3d_z (NUgrid* x_grid, NUgrid* y_grid, NUgrid* z_grid,
BCtype_z xBC, BCtype_z yBC, BCtype_z zBC, complex_double *data);
#ifdef __cplusplus
}
#endif
#endif
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