source: branches/HeuristicLab.Problems.GaussianProcessTuning/ILNumerics.2.14.4735.573/Functions/builtin/tril_u.cs @ 10355

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///    This file is part of ILNumerics Community Edition.
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///    ILNumerics Community Edition - high performance computing for applications.
///    Copyright (C) 2006 - 2012 Haymo Kutschbach, http://ilnumerics.net
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using System;
using System.Collections.Generic;
using System.Text;
using ILNumerics.Storage;
using ILNumerics.Misc;
using ILNumerics.Exceptions;

namespace ILNumerics  {
    public partial class ILMath {

        /// <summary>
        /// Upper triangular part of matrix
        /// </summary>
        /// <typeparam name="T">Inner type of matrix</typeparam>
        /// <param name="A">Input matrix, size [m x n]</param>
        /// <returns>Array of size [m x n], holding upper triangular part of A</returns>
        /// <exception cref="ILNumerics.Exceptions.ILArgumentException">If A has more than 2 dimensions.</exception>
        public static ILRetArray<T> triu <T>(ILInArray<T> A) {
            using (ILScope.Enter(A)) {
                if (A.Size.NumberOfDimensions > 2)
                    throw new ILArgumentException("input argument must be matrix");
                return new ILRetArray<T>(A.Storage.copyUpperTriangle(A.Size[0]));
            }
        }
        /// <summary>
        /// Lower triangular part of matrix
        /// </summary>
        /// <typeparam name="T">Inner type of matrix</typeparam>
        /// <param name="A">Input matrix, size [m x n]</param>
        /// <returns>Array of size [m x n], holding lower triangular part of A</returns>
        /// <exception cref="ILNumerics.Exceptions.ILArgumentException">If A has more than 2 dimensions.</exception>
        public static ILRetArray<T> tril <T>(ILInArray<T> A) {
            using (ILScope.Enter(A)) {
                if (A.Size.NumberOfDimensions > 2)
                    throw new ILArgumentException("input argument must be matrix!");
                return new ILRetArray<T>(A.Storage.copyLowerTriangle());
            }
        }
    }
}