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- /* cheb/test.c
- *
- * Copyright (C) 1996, 1997, 1998, 1999, 2000 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 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., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #include <config.h>
- #include <stdlib.h>
- #include <gsl/gsl_math.h>
- #include <gsl/gsl_errno.h>
- #include <gsl/gsl_test.h>
- #include <gsl/gsl_ieee_utils.h>
- #include <gsl/gsl_chebyshev.h>
-
- double f_sin (double x, void * p) {
- p = 0;
- return sin(x);
- }
-
- int
- main(void)
- {
- double tol = 100.0 * GSL_DBL_EPSILON;
- double x;
-
- gsl_cheb_series * cs = gsl_cheb_alloc(40);
- gsl_cheb_series * csd = gsl_cheb_alloc(40);
- gsl_cheb_series * csi = gsl_cheb_alloc(40);
-
- gsl_function F_sin;
-
- F_sin.function = f_sin;
- F_sin.params = 0;
-
- gsl_ieee_env_setup();
-
- gsl_cheb_init(cs, &F_sin, -M_PI, M_PI);
-
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r = gsl_cheb_eval(cs, x);
- gsl_test_abs(r, sin(x), tol, "gsl_cheb_eval, sin(%.3g)", x);
- }
-
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r, e;
- gsl_cheb_eval_err(cs, x, &r, &e);
- gsl_test_abs(r, sin(x), tol, "gsl_cheb_eval_err, sin(%.3g)", x);
- gsl_test_factor(fabs(r-sin(x)) + GSL_DBL_EPSILON, e, 10.0,
- "gsl_cheb_eval_err, error sin(%.3g)", x);
- }
-
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r = gsl_cheb_eval_n(cs, 25, x);
- gsl_test_abs(r, sin(x), tol, "gsl_cheb_eval_n, sin(%.3g)", x);
- }
-
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r, e;
- gsl_cheb_eval_n_err(cs, 25, x, &r, &e);
- gsl_test_abs(r, sin(x), 100.0 * tol, "gsl_cheb_eval_n_err, deriv sin(%.3g)", x);
- gsl_test_factor(fabs(r-sin(x)) + GSL_DBL_EPSILON, e, 10.0,
- "gsl_cheb_eval_n_err, error sin(%.3g)", x);
- }
-
- /* Test derivative */
-
- gsl_cheb_calc_deriv(csd, cs);
-
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r = gsl_cheb_eval(csd, x);
- gsl_test_abs(r, cos(x), 1600 * tol, "gsl_cheb_eval, deriv sin(%.3g)", x);
- }
-
- #ifdef TEST_DERIVATIVE_ERR
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r, e;
- gsl_cheb_eval_err(csd, x, &r, &e);
- gsl_test_abs(r, cos(x), tol, "gsl_cheb_eval_err, deriv sin(%.3g)", x);
- gsl_test_factor(fabs(r-cos(x)) + GSL_DBL_EPSILON, e, 10.0,
- "gsl_cheb_eval_err, deriv error sin(%.3g)", x);
- }
- #endif
-
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r = gsl_cheb_eval_n(csd, 25, x);
- gsl_test_abs(r, cos(x), 1600 * tol, "gsl_cheb_eval_n, deriv sin(%.3g)", x);
- }
-
- #ifdef TEST_DERIVATIVE_ERR
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r, e;
- gsl_cheb_eval_n_err(csd, 25, x, &r, &e);
- gsl_test_abs(r, cos(x), 100.0 * tol, "gsl_cheb_eval_n_err, deriv sin(%.3g)", x);
- gsl_test_factor(fabs(r-cos(x)) + GSL_DBL_EPSILON, e, 10.0,
- "gsl_cheb_eval_n_err, deriv error sin(%.3g)", x);
- }
- #endif
-
- /* Test integral */
-
- gsl_cheb_calc_integ(csi, cs);
-
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r = gsl_cheb_eval(csi, x);
- gsl_test_abs(r, -(1+cos(x)), tol, "gsl_cheb_eval, integ sin(%.3g)", x);
- }
-
- #ifdef TEST_INTEGRAL_ERR
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r, e;
- gsl_cheb_eval_err(csi, x, &r, &e);
- gsl_test_abs(r, -(1+cos(x)), tol, "gsl_cheb_eval_err, integ sin(%.3g)", x);
- gsl_test_factor(fabs(r-(-1-cos(x))) + GSL_DBL_EPSILON, e, 10.0,
- "gsl_cheb_eval_err, integ error sin(%.3g)", x);
- }
- #endif
-
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r = gsl_cheb_eval_n(csi, 25, x);
- gsl_test_abs(r, -(1+cos(x)), tol, "gsl_cheb_eval_n, integ sin(%.3g)", x);
- }
-
- #ifdef TEST_INTEGRAL_ERR
- for(x=-M_PI; x<M_PI; x += M_PI/100.0) {
- double r, e;
- gsl_cheb_eval_n_err(csi, 25, x, &r, &e);
- gsl_test_abs(r, -(1+cos(x)), 100.0 * tol, "gsl_cheb_eval_n_err, integ sin(%.3g)", x);
- gsl_test_factor(fabs(r-(-1-cos(x))) + GSL_DBL_EPSILON, e, 10.0,
- "gsl_cheb_eval_n_err, integ error sin(%.3g)", x);
- }
- #endif
-
- gsl_cheb_free(csi);
- gsl_cheb_free(csd);
- gsl_cheb_free(cs);
-
- exit (gsl_test_summary());
- }
-