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NFFT
3.3.1
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00001 /* 00002 * Copyright (c) 2002, 2016 Jens Keiner, Stefan Kunis, Daniel Potts 00003 * 00004 * This program is free software; you can redistribute it and/or modify it under 00005 * the terms of the GNU General Public License as published by the Free Software 00006 * Foundation; either version 2 of the License, or (at your option) any later 00007 * version. 00008 * 00009 * This program is distributed in the hope that it will be useful, but WITHOUT 00010 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS 00011 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 00012 * details. 00013 * 00014 * You should have received a copy of the GNU General Public License along with 00015 * this program; if not, write to the Free Software Foundation, Inc., 51 00016 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 00017 */ 00018 00022 #ifndef KERNELS_H 00023 #define KERNELS_H 00024 00025 #include "config.h" 00026 00027 #ifdef HAVE_COMPLEX_H 00028 #include <complex.h> 00029 #endif 00030 00031 #include "nfft3.h" 00032 #include "infft.h" 00033 00034 #ifdef __cplusplus 00035 extern "C" 00036 { 00037 #endif /* __cplusplus */ 00038 00044 C gaussian(R x, int der, const R *param); /* K(x)=exp(-x^2/c^2) */ 00045 C multiquadric(R x, int der, const R *param); /* K(x)=sqrt(x^2+c^2) */ 00046 C inverse_multiquadric(R x, int der, const R *param); /* K(x)=1/sqrt(x^2+c^2) */ 00047 C logarithm(R x, int der, const R *param); /* K(x)=log |x| */ 00048 C thinplate_spline(R x, int der, const R *param); /* K(x) = x^2 log |x| */ 00049 C one_over_square(R x, int der, const R *param); /* K(x) = 1/x^2 */ 00050 C one_over_modulus(R x, int der, const R *param); /* K(x) = 1/|x| */ 00051 C one_over_x(R x, int der, const R *param); /* K(x) = 1/x */ 00052 C inverse_multiquadric3(R x, int der, const R *param); /* K(x) = 1/sqrt(x^2+c^2)^3 */ 00053 C sinc_kernel(R x, int der, const R *param); /* K(x) = sin(cx)/x */ 00054 C cosc(R x, int der, const R *param); /* K(x) = cos(cx)/x */ 00055 C kcot(R x, int der, const R *param); /* K(x) = cot(cx) */ 00056 C one_over_cube(R x, int der, const R *param); /* K(x) = 1/x^3 */ 00057 /* \} */ 00058 00059 #ifdef __cplusplus 00060 } /* extern "C" */ 00061 #endif /* __cplusplus */ 00062 00063 #endif 00064 /* kernels.h */