/usr/include/eclib/realroots.h is in libec-dev 20160101-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 | // realroots.h: declarations of funtions for real roots of polynomials
//////////////////////////////////////////////////////////////////////////
//
// 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
//
//////////////////////////////////////////////////////////////////////////
bigfloat safe_sqrt(const bigfloat& x);
bigfloat cube_root(const bigfloat& x);
// coeff contains deg+1 reals starting with the leading coefficient
// which must be nonzero
//
// we assume the roots are distinct
vector<bigfloat> realroots( const vector<bigfloat>& coeff );
// As above but only root in the interval [-1,1]
vector<bigfloat> realroots11( const vector<bigfloat>& coeff );
|