/usr/include/eclib/kbessel.h is in libec-dev 20160720-2.
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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 | // kbessel.h: implementation of K-Bessel function for arbitrary real
// parameter nu. Adapted from the PARI function kbessel.
//////////////////////////////////////////////////////////////////////////
//
// Copyright 1990-2012 John Cremona
//
// This file is part of the eclib package.
//
// eclib 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.
//
// eclib 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 eclib; if not, write to the Free Software Foundation,
// Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
//
//////////////////////////////////////////////////////////////////////////
#ifndef _KBESSEL_H
#define _KBESSEL_H 1
//flags that this file has been included
double kbessel(double nu, double gx, int debug=0);
inline double K0(double x) {return kbessel(0,x);}
inline double K1(double x) {return kbessel(1,x);}
#endif
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