12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788 |
- /* dht/gsl_dht.h
- *
- * 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 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, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
- */
- /* Author: G. Jungman
- */
- #ifndef __GSL_DHT_H__
- #define __GSL_DHT_H__
- #undef __BEGIN_DECLS
- #undef __END_DECLS
- #ifdef __cplusplus
- # define __BEGIN_DECLS extern "C" {
- # define __END_DECLS }
- #else
- # define __BEGIN_DECLS /* empty */
- # define __END_DECLS /* empty */
- #endif
- __BEGIN_DECLS
- struct gsl_dht_struct {
- size_t size; /* size of the sample arrays to be transformed */
- double nu; /* Bessel function order */
- double xmax; /* the upper limit to the x-sampling domain */
- double kmax; /* the upper limit to the k-sampling domain */
- double * j; /* array of computed J_nu zeros, j_{nu,s} = j[s] */
- double * Jjj; /* transform numerator, J_nu(j_i j_m / j_N) */
- double * J2; /* transform denominator, J_{nu+1}^2(j_m) */
- };
- typedef struct gsl_dht_struct gsl_dht;
- /* Create a new transform object for a given size
- * sampling array on the domain [0, xmax].
- */
- gsl_dht * gsl_dht_alloc(size_t size);
- gsl_dht * gsl_dht_new(size_t size, double nu, double xmax);
- /* Recalculate a transform object for given values of nu, xmax.
- * You cannot change the size of the object since the internal
- * allocation is reused.
- */
- int gsl_dht_init(gsl_dht * t, double nu, double xmax);
- /* The n'th computed x sample point for a given transform.
- * 0 <= n <= size-1
- */
- double gsl_dht_x_sample(const gsl_dht * t, int n);
- /* The n'th computed k sample point for a given transform.
- * 0 <= n <= size-1
- */
- double gsl_dht_k_sample(const gsl_dht * t, int n);
- /* Free a transform object.
- */
- void gsl_dht_free(gsl_dht * t);
- /* Perform a transform on a sampled array.
- * f_in[0] ... f_in[size-1] and similarly for f_out[]
- */
- int gsl_dht_apply(const gsl_dht * t, double * f_in, double * f_out);
- __END_DECLS
- #endif /* __GSL_DHT_H__ */
|