source: branches/HeuristicLab.Problems.GaussianProcessTuning/ILNumerics.2.14.4735.573/Functions/builtin/ind2sub.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
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using System;
using System.Collections.Generic;
using System.Text;
using ILNumerics;
using ILNumerics.Exceptions;
using ILNumerics.Storage;
using ILNumerics.Misc;

namespace ILNumerics {
    public partial class ILMath {
        /// <summary>
        /// Convert sequential index into subscript indices
        /// </summary>
        /// <param name="A">Input array</param>
        /// <param name="seqindex">Sequential index</param>
        /// <returns>Subscript indices</returns>
        /// <remarks><para>The index array returned will have the length of number of dimensions of A</para>
        /// <para>If A is a null or an empty array, the return value will be also be empty</para>
        /// </remarks>
        /// <exception cref="System.IndexOutOfRangeException">If seqindex is &lt; 0 or &gt;= numel(A)</exception>
        public static ILRetArray<double> ind2sub(ILBaseArray A, int seqindex) {
            using (ILScope.Enter(A)) {
                if (object.Equals(A, null) || A.IsEmpty)
                    return empty();
                if (seqindex < 0 || seqindex >= A.Size.NumberOfElements)
                    throw new ILArgumentException("index out of range: " + seqindex);
                int IdxCpy = seqindex;
                ILArray<double> ret = zeros(1, A.Size.NumberOfDimensions);
                for (int d = 0; d < ret.Length; d++) {
                    ret.SetValue(IdxCpy % A.Size[d], d);
                    IdxCpy /= A.Size[d];
                }
                return ret;
            }
        }
    }
}