ComplexMatrixItem(Int32, String) Property

Gets or sets the elements of this instance corresponding to the specified row and column indexes.

Definition

Namespace: Novacta.Analytics
Assembly: Novacta.Analytics (in Novacta.Analytics.dll) Version: 2.1.0+428f3840cfab98dda567bb0ed350b302533e273a

C#

public ComplexMatrix this[
	int rowIndex,
	string columnIndexes
] { get; set; }

VB

Public Default Property Item ( 
	rowIndex As Integer,
	columnIndexes As String
) As ComplexMatrix
	Get
	Set

C++

public:
virtual property ComplexMatrix^ default[int rowIndex, String^ columnIndexes] {
	ComplexMatrix^ get (int rowIndex, String^ columnIndexes) sealed;
	void set (int rowIndex, String^ columnIndexes, ComplexMatrix^ value) sealed;
}

F#

abstract Item : ComplexMatrix with get, set
override Item : ComplexMatrix with get, set

Parameters

rowIndex Int32: The zero-based row index of the elements to get or set.
columnIndexes String: The zero-based column indexes of the elements to get or set. The value must be ":", which means that all valid column indexes are specified.

Property Value

ComplexMatrix
A tabular collection formed by the elements corresponding to the specified row and column indexes.

Implements

IReadOnlyTabularCollectionTValue, TCollectionItemInt32, String
ITabularCollectionTValue, TCollectionItemInt32, String

Remarks

When setting elements simultaneously, the value must be a tabular collection having a number of rows equal to the number of specified row indexes, and a number of columns equal to the number of specified column indexes.

Example

In the following example, some matrix elements are simultaneously accessed.

C#

using System;
using System.Numerics;

namespace Novacta.Analytics.CodeExamples
{
    public class ComplexMatrixIndexerExample02  
    {
        public void Main()
        {
            // Create a matrix.
            var data = new Complex[8] {
                new(1, -1), new(5, -5),
                new(2, -2), new(6, -6),
                new(3, -3), new(7, -7),
                new(4, -4), new(8, -8)
            };
            var matrix = ComplexMatrix.Dense(4, 2, data, StorageOrder.RowMajor);
            Console.WriteLine("Initial data matrix:");
            Console.WriteLine(matrix);

            // Specify a row index.
            int rowIndex = 3;
            Console.WriteLine();
            Console.WriteLine("Row index: {0}", rowIndex);

            // Specify all column indexes.
            var columnIndexes = ":";
            Console.WriteLine();
            Console.WriteLine("Column indexes: from 0 to {0}", matrix.NumberOfColumns - 1);

            // Specify the value matrix.
            var valueData = new Complex[2] {
                new(40, -40), new(80, -80)
            };
            var value = ComplexMatrix.Dense(1, 2, valueData, StorageOrder.RowMajor);
            Console.WriteLine();
            Console.WriteLine("Value matrix:");
            Console.WriteLine(value);

            // Set the entries having the specified indexes to the value matrix.
            matrix[rowIndex, columnIndexes] = value;

            Console.WriteLine();
            Console.WriteLine("Updated data matrix:");
            Console.WriteLine(matrix);

            // Entries can also be accessed using a read-only wrapper 
            // of the matrix.
            ReadOnlyComplexMatrix readOnlyMatrix = matrix.AsReadOnly();

            Console.WriteLine();
            Console.WriteLine("Updated matrix entries:");
            Console.WriteLine(readOnlyMatrix[rowIndex, columnIndexes]);
        }
    }
}

// Executing method Main() produces the following output:
// 
// Initial data matrix:
// (                1,               -1) (                5,               -5) 
// (                2,               -2) (                6,               -6) 
// (                3,               -3) (                7,               -7) 
// (                4,               -4) (                8,               -8) 
// 
// 
// 
// Row index: 3
// 
// Column indexes: from 0 to 1
// 
// Value matrix:
// (               40,              -40) (               80,              -80) 
// 
// 
// 
// Updated data matrix:
// (                1,               -1) (                5,               -5) 
// (                2,               -2) (                6,               -6) 
// (                3,               -3) (                7,               -7) 
// (               40,              -40) (               80,              -80) 
// 
// 
// 
// Updated matrix entries:
// (               40,              -40) (               80,              -80) 
// 
//

Exceptions

ArgumentNullException	columnIndexes is null. -or- value is null.
ArgumentOutOfRangeException	rowIndex is less than zero. -or- rowIndex is greater than or equal to the number of rows of this instance. -or- columnIndexes is not a string reserved for tabular collection sub-referencing.
ArgumentException	The number of rows in value is greater than 1. -or- The number of columns in value is not equal to the number of columns of this instance.