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Dwsim / data /DWSIM.Math.DotNumerics /LinearAlgebra /BaseBandMatrix.cs
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#region Copyright � 2009, De Santiago-Castillo JA. All rights reserved.
//Copyright � 2009 Jose Antonio De Santiago-Castillo
//E-mail:JAntonioDeSantiago@gmail.com
//Web: www.DotNumerics.com
//
#endregion
using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
namespace DotNumerics.LinearAlgebra
{
/// <summary>
/// Represents the base class for band matrices.
/// </summary>
public abstract class BaseBandMatrix: BaseMatrix
{
#region Fields
/// <summary>
/// Number of bands below the main diagonal (lowerBandWidth)
/// </summary>
[DebuggerBrowsable(DebuggerBrowsableState.Never)]
protected int MeLowerBandWidth;
/// <summary>
/// Number of bands above the main diagonal (upperBandWidth)
/// </summary>
[DebuggerBrowsable(DebuggerBrowsableState.Never)]
protected int MeUpperBandWidth;
///// <summary>
///// Number of rows of the reduced matrix
///// </summary>
//[DebuggerBrowsable(DebuggerBrowsableState.Never)]
//private int MeReducedMatrixRows;
#endregion
#region Public Constructors
/// <summary>
/// Initializes a new instance of the BandMatrix class of the given size.
/// </summary>
/// <param name="rows">Number of rows.</param>
/// <param name="columns">Number of columns.</param>
/// <param name="lowerBandWidth">Number of bands below the main diagonal</param>
/// <param name="upperBandWidth">Number of bands above the main diagonal</param>
public BaseBandMatrix(int rows, int columns, int lowerBandWidth, int upperBandWidth)
: base(rows, columns)
{
if (lowerBandWidth < 0 || lowerBandWidth >= rows) throw new System.ArgumentException("lowerBandWidth < 0 || lowerBandWidth >= rows"); //Debe de ser menor que rows
if (upperBandWidth < 0 || upperBandWidth >= columns) throw new System.ArgumentException("upperBandWidth < 0 || upperBandWidth >= columns"); //Debe de ser menor que columns
// For an m by n matrix A with band widths ml and mu, the array AGB must have a leading dimension, lda,
//greater than or equal to ml+mu+1. The size of the second dimension must be (at least) n, the number of columns in the matrix.
//Using the array AGB, which is declared as AGB(ml+mu+1, n)
this.MeLowerBandWidth = lowerBandWidth;
this.MeUpperBandWidth = upperBandWidth;
//this.MeReducedMatrixRows = lowerBandWidth + upperBandWidth + 1;
}
/// <summary>
/// Initializes a new instance of the BandMatrix class of the given size using a array
/// </summary>
/// <param name="rows">Number of rows.</param>
/// <param name="columns">Number of columns.</param>
/// <param name="lowerBandWidth">Number of bands below the main diagonal</param>
/// <param name="upperBandWidth">Number of bands above the main diagonal</param>
/// <param name="Data">The matix data </param>
internal BaseBandMatrix(int rows, int columns, int lowerBandWidth, int upperBandWidth, double[] Data)
: base(rows, columns, Data)
{
if (lowerBandWidth < 0 || lowerBandWidth >= rows) throw new System.ArgumentException("lowerBandWidth < 0 || lowerBandWidth >= rows"); //Debe de ser menor que rows
if (upperBandWidth < 0 || upperBandWidth >= columns) throw new System.ArgumentException("upperBandWidth < 0 || upperBandWidth >= columns"); //Debe de ser menor que columns
this.MeLowerBandWidth = lowerBandWidth;
this.MeUpperBandWidth = upperBandWidth;
//this.MeReducedMatrixRows = lowerBandWidth + upperBandWidth + 1;
}
/// <summary>
/// Initializes a new instance of the BandMatrix class of the given size using a array
/// </summary>
/// <param name="size">Size</param>
/// <param name="lowerBandWidth">Number of bands below the main diagonal</param>
/// <param name="upperBandWidth">Number of bands above the main diagonal</param>
internal BaseBandMatrix(int size, int lowerBandWidth, int upperBandWidth)
: base(size)
{
if (lowerBandWidth < 0 || lowerBandWidth >= size) throw new System.ArgumentException("lowerBandWidth < 0 || lowerBandWidth >= rows"); //Debe de ser menor que rows
if (upperBandWidth < 0 || upperBandWidth >= size) throw new System.ArgumentException("upperBandWidth < 0 || upperBandWidth >= columns"); //Debe de ser menor que columns
this.MeLowerBandWidth = lowerBandWidth;
this.MeUpperBandWidth = upperBandWidth;
//this.MeReducedMatrixRows = lowerBandWidth + upperBandWidth + 1;
}
/// <summary>
/// Initializes a new instance of the BandMatrix class of the given size using a array
/// </summary>
/// <param name="size">Size</param>
/// <param name="Data">The matix data </param>
/// <param name="lowerBandWidth">Number of bands below the main diagonal</param>
/// <param name="upperBandWidth">Number of bands above the main diagonal</param>
internal BaseBandMatrix(int size, int lowerBandWidth, int upperBandWidth, double[] Data)
: base(size, Data)
{
if (lowerBandWidth < 0 || lowerBandWidth >= size) throw new System.ArgumentException("lowerBandWidth < 0 || lowerBandWidth >= rows"); //Debe de ser menor que rows
if (upperBandWidth < 0 || upperBandWidth >= size) throw new System.ArgumentException("upperBandWidth < 0 || upperBandWidth >= columns"); //Debe de ser menor que columns
this.MeLowerBandWidth = lowerBandWidth;
this.MeUpperBandWidth = upperBandWidth;
//this.MeReducedMatrixRows = lowerBandWidth + upperBandWidth + 1;
}
#endregion
#region Overloading Operators
#endregion
#region Public Methods
/// <summary>
/// Returns the value of a element of the matrix.
/// </summary>
/// <param name="row">The row value (zero-based).</param>
/// <param name="column">The column value (zero-based).</param>
/// <returns>The matrix value at (row, column).</returns>
public override double this[int row, int column]
{
get
{
if (column >= this._ColumnCount)
{
throw new ArgumentException("Index was outside the bounds of the matrix.");
}
return this._Data[row + column * this._RowCount];
}
set
{
if (column >= this._ColumnCount)
{
throw new ArgumentException("Index was outside the bounds of the matrix.");
}
//A general band matrix has its nonzero elements arranged uniformly near the diagonal, such that:
//aij = 0 if (i-j) > ml or (j-i) > mu
if ((row - column) <= this.MeLowerBandWidth && (column - row) <= this.MeUpperBandWidth)
{
this._Data[row + column * this._RowCount] = value;
}
}
}
/// <summary>
/// Number of bands below the main diagonal (lowerBandWidth)
/// </summary>
[DebuggerBrowsable(DebuggerBrowsableState.Never)]
public int LowerBandWidth
{
get { return MeLowerBandWidth; }
}
/// <summary>
/// Number of bands above the main diagonal (upperBandWidth)
/// </summary>
[DebuggerBrowsable(DebuggerBrowsableState.Never)]
public int UpperBandWidth
{
get { return MeUpperBandWidth; }
}
#region Static methods
/// <summary>
/// Implicit BaseBandMatrix to Matrix conversion.
/// </summary>
/// <param name="bandMatrix">The BandMatrix</param>
/// <returns>The Matrix.</returns>
public static implicit operator Matrix(BaseBandMatrix bandMatrix)
{
Matrix NewMatrix = new Matrix(bandMatrix.RowCount, bandMatrix.ColumnCount, bandMatrix.Data);
return NewMatrix;
}
#endregion
#endregion
#region Private Methods
#endregion
}
}