-
Notifications
You must be signed in to change notification settings - Fork 11
/
interp2d_spline.c
144 lines (123 loc) · 6.98 KB
/
interp2d_spline.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
/*
* This file is part of interp2d, a GSL-compatible two-dimensional
* interpolation library. <http://www.ellipsix.net/interp2d.html>
*
* Copyright 2012 David Zaslavsky
* Portions based on GNU GSL interpolation code,
* copyright 1996, 1997, 1998, 1999, 2000, 2004 Gerard Jungman
*
* 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/>.
*/
#include <string.h>
#include <gsl/gsl_errno.h>
#include <gsl/gsl_math.h>
#include "interp2d_spline.h"
interp2d_spline* interp2d_spline_alloc(const interp2d_type* T, size_t xsize, size_t ysize) {
double* array_mem;
interp2d_spline* interp;
if (xsize < T->min_size || ysize < T->min_size) {
GSL_ERROR_NULL("insufficient number of points for interpolation type", GSL_EINVAL);
}
interp = (interp2d_spline*)malloc(sizeof(interp2d_spline));
if (interp == NULL) {
GSL_ERROR_NULL("failed to allocate space for interp2d_spline struct", GSL_ENOMEM);
}
interp->interp_object.type = T;
interp->interp_object.xsize = xsize;
interp->interp_object.ysize = ysize;
if (interp->interp_object.type->alloc == NULL) {
interp->interp_object.state = NULL;
}
else {
interp->interp_object.state = interp->interp_object.type->alloc(xsize, ysize);
if (interp->interp_object.state == NULL) {
free(interp);
GSL_ERROR_NULL("failed to allocate space for interp2d_spline state", GSL_ENOMEM);
}
}
// Use one contiguous block of memory for all three data arrays.
// That way the code fails immediately if there isn't sufficient space for everything,
// rather than allocating one or two and then having to free them.
array_mem = (double*)calloc(xsize + ysize + xsize * ysize, sizeof(double));
if (array_mem == NULL) {
interp->interp_object.type->free(interp->interp_object.state);
free(interp);
GSL_ERROR_NULL("failed to allocate space for data arrays", GSL_ENOMEM);
}
interp->xarr = array_mem;
interp->yarr = array_mem + xsize;
interp->zarr = array_mem + xsize + ysize;
return interp;
}
int interp2d_spline_init(interp2d_spline* interp, const double xarr[], const double yarr[], const double zarr[], size_t xsize, size_t ysize) {
int status = interp2d_init(&(interp->interp_object), xarr, yarr, zarr, xsize, ysize);
memcpy(interp->xarr, xarr, xsize * sizeof(double));
memcpy(interp->yarr, yarr, ysize * sizeof(double));
memcpy(interp->zarr, zarr, xsize * ysize * sizeof(double));
return status;
}
void interp2d_spline_free(interp2d_spline* interp) {
if (!interp) {
return;
}
if (interp->interp_object.type->free) {
interp->interp_object.type->free(interp->interp_object.state);
}
// interp->xarr points to the beginning of one contiguous block of memory
// that holds interp->xarr, interp->yarr, and interp->zarr. So it all gets
// freed with one call. cf. interp2d_spline_alloc() implementation
free(interp->xarr);
free(interp);
}
// All these methods just call their interp2d_eval* equivalents
double interp2d_spline_eval(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya) {
return interp2d_eval(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya);
}
int interp2d_spline_eval_e(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya, double* z) {
return interp2d_eval_e(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya, z);
}
double interp2d_spline_eval_deriv_x(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya) {
return interp2d_eval_deriv_x(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya);
}
int interp2d_spline_eval_deriv_x_e(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya, double* z) {
return interp2d_eval_deriv_x_e(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya, z);
}
double interp2d_spline_eval_deriv_y(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya) {
return interp2d_eval_deriv_y(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya);
}
int interp2d_spline_eval_deriv_y_e(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya, double* z) {
return interp2d_eval_deriv_y_e(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya, z);
}
double interp2d_spline_eval_deriv_xx(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya) {
return interp2d_eval_deriv_xx(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya);
}
int interp2d_spline_eval_deriv_xx_e(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya, double* z) {
return interp2d_eval_deriv_xx_e(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya, z);
}
double interp2d_spline_eval_deriv_yy(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya) {
return interp2d_eval_deriv_yy(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya);
}
int interp2d_spline_eval_deriv_yy_e(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya, double* z) {
return interp2d_eval_deriv_yy_e(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya, z);
}
double interp2d_spline_eval_deriv_xy(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya) {
return interp2d_eval_deriv_xy(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya);
}
int interp2d_spline_eval_deriv_xy_e(const interp2d_spline* interp, const double x, const double y, gsl_interp_accel* xa, gsl_interp_accel* ya, double* z) {
return interp2d_eval_deriv_xy_e(&(interp->interp_object), interp->xarr, interp->yarr, interp->zarr, x, y, xa, ya, z);
}
size_t interp2d_spline_min_size(const interp2d_spline* interp) {
return interp2d_min_size(&(interp->interp_object));
}
const char* interp2d_spline_name(const interp2d_spline* interp) {
return interp2d_name(&(interp->interp_object));
}