/* poly/norm.c * * Copyright (C) 1996, 1997, 1998, 1999, 2000 Brian Gough * * 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. */ static double norm_companion (const double *m, size_t nc); static double norm_companion (const double *m, size_t nc) { size_t i; double A, s2 = 0; for (i = 1; i < nc - 1; i++) { const double t = MAT (m, i + 1, i, nc); s2 += t * t; } for (i = 0; i < nc; i++) { const double t = MAT (m, i, nc, nc); s2 += t * t; } A = sqrt (s2); return A; }

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