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/* blas/source_nrm2_c.h
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*
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* Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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{
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BASE scale = 0.0;
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BASE ssq = 1.0;
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INDEX i;
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INDEX ix = 0;
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if (N == 0 || incX < 1) {
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return 0;
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}
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for (i = 0; i < N; i++) {
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const BASE x = CONST_REAL(X, ix);
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const BASE y = CONST_IMAG(X, ix);
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if (x != 0.0) {
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const BASE ax = fabs(x);
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if (scale < ax) {
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ssq = 1.0 + ssq * (scale / ax) * (scale / ax);
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scale = ax;
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} else {
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ssq += (ax / scale) * (ax / scale);
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}
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}
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if (y != 0.0) {
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const BASE ay = fabs(y);
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if (scale < ay) {
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ssq = 1.0 + ssq * (scale / ay) * (scale / ay);
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scale = ay;
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} else {
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ssq += (ay / scale) * (ay / scale);
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}
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}
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ix += incX;
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}
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return scale * sqrt(ssq);
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}
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