source: branches/HeuristicLab.Problems.GaussianProcessTuning/ILNumerics.2.14.4735.573/Functions/builtin/cross.cs @ 9102

///
///    This file is part of ILNumerics Community Edition.
///
///    ILNumerics Community Edition - high performance computing for applications.
///    Copyright (C) 2006 - 2012 Haymo Kutschbach, http://ilnumerics.net
///
///    ILNumerics Community Edition is free software: you can redistribute it and/or modify
///    it under the terms of the GNU General Public License version 3 as published by
///    the Free Software Foundation.
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///    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
///    GNU General Public License for more details.
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///    You should have received a copy of the GNU General Public License
///    along with ILNumerics Community Edition. See the file License.txt in the root
///    of your distribution package. If not, see <http://www.gnu.org/licenses/>.
///
///    In addition this software uses the following components and/or licenses: 
///
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///    The Open Toolkit Library License
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///    Copyright (c) 2006 - 2009 the Open Toolkit library.
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///    of this software and associated documentation files (the "Software"), to deal
///    in the Software without restriction, including without limitation the rights to 
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using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices; 
using ILNumerics.Storage;
using ILNumerics.Misc;
using ILNumerics.Native;
using ILNumerics.Exceptions;


namespace ILNumerics {

    public partial class ILMath {


        /// <summary>
        /// Cross products of columns of two arrays 
        /// </summary>
        /// <param name="A">First array with vectors in columns</param>
        /// <param name="B">Second array with vectors in columns</param>
        /// <returns>Array with cross products of vectors from A and B</returns>
        /// <exception cref="ILNumerics.Exceptions.ILArgumentException">If the size of both arguments is not the same.</exception>
        public static ILRetArray<double> cross(ILInArray<double> A, 
                                                            ILInArray<double> B,
                                                            bool normalize = false) {
            using (ILScope.Enter(A, B)) {
                if (!A.Size.IsSameSize(B.Size))
                    throw new ILArgumentException("input arrays must have the same size!");
                ILArray<double> ret = array<double>(A.Size);
                using (ILScope.Enter()) {
                    ILArray<double> Ax = A[0, full];
                    ILArray<double> Ay = A[1, full];
                    ILArray<double> Az = A[2, full];
                    ILArray<double> Bx = B[0, full];
                    ILArray<double> By = B[1, full];
                    ILArray<double> Bz = B[2, full];
                    ret[0, full] = Ay * Bz - Az * By;
                    ret[1, full] = Az * Bx - Ax * Bz;
                    ret[2, full] = Ax * By - Ay * Bx;
                }
                if (!normalize)
                    return ret; 
                else 
                    return ret / sqrt(sum(ret * ret,0)); 
            }
        }

#region HYCALPER AUTO GENERATED CODE

        /// <summary>
        /// Cross products of columns of two arrays 
        /// </summary>
        /// <param name="A">First array with vectors in columns</param>
        /// <param name="B">Second array with vectors in columns</param>
        /// <returns>Array with cross products of vectors from A and B</returns>
        /// <exception cref="ILNumerics.Exceptions.ILArgumentException">If the size of both arguments is not the same.</exception>
        public static ILRetArray<float> cross(ILInArray<float> A, 
                                                            ILInArray<float> B,
                                                            bool normalize = false) {
            using (ILScope.Enter(A, B)) {
                if (!A.Size.IsSameSize(B.Size))
                    throw new ILArgumentException("input arrays must have the same size!");
                ILArray<float> ret = array<float>(A.Size);
                using (ILScope.Enter()) {
                    ILArray<float> Ax = A[0, full];
                    ILArray<float> Ay = A[1, full];
                    ILArray<float> Az = A[2, full];
                    ILArray<float> Bx = B[0, full];
                    ILArray<float> By = B[1, full];
                    ILArray<float> Bz = B[2, full];
                    ret[0, full] = Ay * Bz - Az * By;
                    ret[1, full] = Az * Bx - Ax * Bz;
                    ret[2, full] = Ax * By - Ay * Bx;
                }
                if (!normalize)
                    return ret; 
                else 
                    return ret / sqrt(sum(ret * ret,0)); 
            }
        }

#endregion HYCALPER AUTO GENERATED CODE

    }
}