[8401] | 1 | #region License Information
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| 2 | /* HeuristicLab
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| 3 | * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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| 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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[8323] | 21 |
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| 22 | using System;
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| 23 | using System.Collections.Generic;
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| 24 | using System.Linq;
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| 25 |
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[8371] | 26 | namespace HeuristicLab.Algorithms.DataAnalysis {
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[8323] | 27 | public static class Util {
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| 28 | public static double ScalarProd(IEnumerable<double> v, IEnumerable<double> u) {
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| 29 | return v.Zip(u, (vi, ui) => vi * ui).Sum();
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| 30 | }
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| 31 |
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| 32 | public static double SqrDist(double x, double y) {
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| 33 | double d = x - y;
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| 34 | return Math.Max(d * d, 0.0);
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| 35 | }
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| 36 |
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| 37 | public static double SqrDist(IEnumerable<double> x, IEnumerable<double> y) {
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[8371] | 38 | return x.Zip(y, SqrDist).Sum();
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[8323] | 39 | }
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| 40 |
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| 41 | public static IEnumerable<double> GetRow(double[,] x, int r) {
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| 42 | int cols = x.GetLength(1);
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| 43 | return Enumerable.Range(0, cols).Select(c => x[r, c]);
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| 44 | }
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[8366] | 45 | public static IEnumerable<double> GetCol(double[,] x, int c) {
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| 46 | int rows = x.GetLength(0);
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| 47 | return Enumerable.Range(0, rows).Select(r => x[r, c]);
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| 48 | }
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[8323] | 49 | }
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| 50 | }
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