Matrix.cs

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using System;
using System.Text;
using ClearCanvas.Common;


namespace DicomImageViewer.Dicom
{
	internal class Matrix
	{
		private readonly int _rows;
		private readonly int _columns;

		private readonly float[,] _matrix;

		public Matrix(int rows, int columns)
		{
			Platform.CheckPositive(rows, "rows");
			Platform.CheckPositive(columns, "columns");

			_rows = rows;
			_columns = columns;

			_matrix = new float[rows, columns];
		}

		private Matrix(int rows, int columns, float[,] matrix)
		{
			_matrix = matrix;
			_rows = rows;
			_columns = columns;
		}

		public int Rows
		{
			get { return _rows; }	
		}

		public int Columns
		{
			get { return _columns; }
		}



		public float this[int row, int column]
		{
			get
			{
				Platform.CheckArgumentRange(row, 0, _rows - 1, "row");
				Platform.CheckArgumentRange(column, 0, _columns - 1, "column");

				return _matrix[row, column];
			}
			set
			{
				Platform.CheckArgumentRange(row, 0, _rows - 1, "row");
				Platform.CheckArgumentRange(column, 0, _columns - 1, "column");

				_matrix[row, column] = value;
			}
		}
		
		private void Scale(float scale)
		{
			for (int row = 0; row < _rows; ++row)
			{
				for (int column = 0; column < _columns; ++column)
					this[row, column] = this[row, column] * scale;
			}
		}
	    
		public void SetColumn(int column, params float[] values)
		{
			Platform.CheckArgumentRange(column, 0, _columns - 1, "column");
			Platform.CheckTrue(values.Length == _rows, "number of parameters == _rows");

			for (int row = 0; row < _rows; ++row)
				_matrix[row, column] = values[row];
		}
		
		public Matrix Clone()
		{
			float[,] matrix = (float[,])_matrix.Clone();
			for (int row = 0; row < _rows; ++row)
			{
				for (int column = 0; column < _columns; ++column)
					matrix[row, column] = _matrix[row, column];
			}
			
			return new Matrix(_rows, _columns, matrix);
		}


		public override string ToString()
		{
			StringBuilder builder = new StringBuilder();

			for(int row = 0; row < _rows; ++row)
			{
				builder.Append("( ");
				for(int column = 0; column < _columns; ++column)
				{
					builder.Append(_matrix[row, column].ToString("F4"));
					if (column < (_columns - 1))
						builder.Append("  ");
				}

				builder.Append(")");
				if (row < (_rows - 1))
					builder.Append(", ");
			}

			return builder.ToString();
		}

		public static Matrix operator *(Matrix left, Matrix right)
		{
			if (left.Columns != right.Rows)
				throw new ArgumentException("Cannot multiply the two matrices together; their sizes are incompatible.");

			Matrix result = new Matrix(left.Rows, right.Columns);
			int mutualDimension = right.Rows;

			for (int row = 0; row < result.Rows; ++row)
			{
				for (int column = 0; column < result.Columns; ++column)
				{
					float value = 0F;

					for (int k = 0; k < mutualDimension; ++k)
						value = value + left[row, k] * right[k, column];

					result[row, column] = value;
				}
			}

			return result;
		}
		
	}
}