/// <summary>
/// Returns an array with count of elements on each row in <see cref="IJuggedMatrix{T}"/>
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="matrix"></param>
/// <returns></returns>
public static IEnumerable <int> CountOnEachRow <T>(this IJuggedMatrix <T> matrix)
{
for (var i = 0; i < matrix.RowsCount; i++)
{
yield return(matrix.ElementsInRow(i));
}
}
/// <summary>
/// Returns the subtraction <see cref="IJuggedMatrix{T}"/> <paramref name="first"/> and
/// <see cref="IJuggedMatrix{T}"/> <paramref name="second"/>
/// </summary>
/// <param name="first">First matrix</param>
/// <param name="second">Second matrix</param>
/// <returns>
/// New <see cref="IJuggedMatrix{T}"/> - the result subtraction of matrices <paramref name="first"/> and
/// <paramref name="second"/>
/// </returns>
public static IJuggedMatrix <int> Sub(this IJuggedMatrix <int> first, IJuggedMatrix <int> second)
{
if (first.RowsCount != second.RowsCount)
{
throw new
MatrixInvalidOperationException("Can't sub second JuggedMatrix to first. Count of rows should be the same");
}
for (var i = 0; i < first.RowsCount; i++)
{
if (first.ElementsInRow(i) != second.ElementsInRow(i))
{
throw new
MatrixInvalidOperationException("Can't add second JuggedMatrix to first. Count of columns should be the same");
}
}
var juggedMatrix = new JuggedMatrix <int>(first.RowsCount,
first.CountOnEachRow()
.ToArray());
for (var i = 0; i < first.RowsCount; i++)
{
for (var j = 0; j < first.ElementsInRow(i); j++)
{
juggedMatrix[i, j] = first[i, j] - second[i, j];
}
}
return(juggedMatrix);
}
/// <summary>
/// Fills <paramref name="juggedMatrix"/> with randomly numbers
/// </summary>
/// <param name="juggedMatrix">Initial matrix</param>
/// <param name="min">Minimal value</param>
/// <param name="max">Maximal value</param>
public static void FillRandomly(this IJuggedMatrix <decimal> juggedMatrix, decimal min = -50, decimal max = 50)
{
var rnd = new Random();
for (var i = 0; i < juggedMatrix.RowsCount; i++)
{
for (var j = 0; j < juggedMatrix.ElementsInRow(i); j++)
{
juggedMatrix[i, j] = (decimal)rnd.NextDouble((double)min, (double)max);
}
}
}
/// <summary>
/// Fills <paramref name="juggedMatrix"/> with randomly numbers
/// </summary>
/// <param name="juggedMatrix">Initial matrix</param>
/// <param name="min">Minimal value</param>
/// <param name="max">Maximal value</param>
public static void FillRandomly(this IJuggedMatrix <long> juggedMatrix, long min = -50, long max = 50)
{
var rnd = new Random();
for (var i = 0; i < juggedMatrix.RowsCount; i++)
{
for (var j = 0; j < juggedMatrix.ElementsInRow(i); j++)
{
juggedMatrix[i, j] = rnd.NextLong(min, max);
}
}
}
/// <summary>
/// Creates a new <see cref="IJuggedMatrix{T}"/> matrix without column at <paramref name="columnIndex"/>
/// </summary>
/// <param name="juggedMatrix"></param>
/// <param name="columnIndex">Column index to remove</param>
/// <returns>A new <see cref="IJuggedMatrix{T}"/> matrix without column at <paramref name="columnIndex"/></returns>
public static IJuggedMatrix <T> CreateMatrixWithoutColumn <T>(this IJuggedMatrix <T> juggedMatrix, int columnIndex)
{
if (ReferenceEquals(juggedMatrix, null))
{
throw new ArgumentNullException(nameof(juggedMatrix));
}
var maxColumn = juggedMatrix.Max(x => x.Count());
if (columnIndex < 0)
{
throw new ArgumentException("Column index is < 0");
}
if (columnIndex >= maxColumn)
{
throw new ArgumentException("Column index is out of range in matrix");
}
var tempMatrix = new T[juggedMatrix.RowsCount][];
for (var i = 0; i < juggedMatrix.RowsCount; i++)
{
var currentColumn = 0;
var elementsInRow = juggedMatrix.ElementsInRow(i);
if (columnIndex < elementsInRow)
{
tempMatrix[i] = new T[elementsInRow - 1];
}
else
{
tempMatrix[i] = new T[elementsInRow];
}
for (var j = 0; j < elementsInRow; j++)
{
if (j == columnIndex)
{
continue;
}
tempMatrix[i][currentColumn] = juggedMatrix[i, j];
currentColumn++;
}
}
var newMatrix = new JuggedMatrix <T>(tempMatrix);
return(newMatrix);
}
/// <summary>
/// Fills <paramref name="juggedMatrix"/> with randomly numbers
/// </summary>
/// <param name="juggedMatrix">Initial matrix</param>
/// <param name="min">Minimal value</param>
/// <param name="max">Maximal value</param>
public static void FillRandomly(this IJuggedMatrix <int?> juggedMatrix, int min = -50, int max = 50)
{
var rnd = new Random();
for (var i = 0; i < juggedMatrix.RowsCount; i++)
{
for (var j = 0; j < juggedMatrix.ElementsInRow(i); j++)
{
if (juggedMatrix[i, j] != null)
{
juggedMatrix[i, j] = rnd.Next(min, max + 1);
}
}
}
}
/// <summary>
/// Returns the multiplication <see cref="IJuggedMatrix{T}"/> <paramref name="matrix"/> on <see cref="decimal"/>
/// <paramref name="number"/>
/// </summary>
/// <param name="matrix">First</param>
/// <param name="number"></param>
/// <returns>
/// New <see cref="IJuggedMatrix{T}"/> - the result multiplication of matrix <paramref name="matrix"/> on
/// <paramref name="number"/>
/// </returns>
public static IJuggedMatrix <decimal> MulOnNumber(this IJuggedMatrix <decimal> matrix, decimal number)
{
var juggedMatrix = new JuggedMatrix <decimal>(matrix.RowsCount,
matrix.CountOnEachRow()
.ToArray());
for (var i = 0; i < matrix.RowsCount; i++)
{
for (var j = 0; j < matrix.ElementsInRow(i); j++)
{
juggedMatrix[i, j] = matrix[i, j] * number;
}
}
return(juggedMatrix);
}
/// <summary>
/// Returns the multiplication <see cref="IJuggedMatrix{T}"/> <paramref name="matrix"/> on <see cref="int"/>
/// <paramref name="number"/>
/// </summary>
/// <param name="matrix">First</param>
/// <param name="number"></param>
/// <returns>
/// New <see cref="IJuggedMatrix{T}"/> - the result multiplication of matrix <paramref name="matrix"/> on
/// <paramref name="number"/>
/// </returns>
public static IJuggedMatrix <string> MulOnNumber(this IJuggedMatrix <string> matrix, int number)
{
var juggedMatrix = new JuggedMatrix <string>(matrix.RowsCount,
matrix.CountOnEachRow()
.ToArray());
for (var i = 0; i < matrix.RowsCount; i++)
{
for (var j = 0; j < matrix.ElementsInRow(i); j++)
{
juggedMatrix[i, j] = matrix[i, j]
.Concat(number);
}
}
return(juggedMatrix);
}
//TODO: unit-test
/// <summary>
/// Creates a vanilla array of arrays
/// <see>
/// <cref>T</cref>
/// </see>
/// [][]
/// </summary>
/// <returns>Vanilla array of arrays which represents initial matrix</returns>
public static T[][] CreateVanilla <T>(this IJuggedMatrix <T> juggedMatrix)
{
if (ReferenceEquals(juggedMatrix, null))
{
throw new ArgumentNullException(nameof(juggedMatrix));
}
var tempMatrix = new T[juggedMatrix.RowsCount][];
for (var i = 0; i < juggedMatrix.RowsCount; i++)
{
tempMatrix[i] = new T[juggedMatrix.ElementsInRow(i)];
for (var j = 0; j < juggedMatrix.ElementsInRow(i); j++)
{
tempMatrix[i][j] = juggedMatrix[i, j];
}
}
return(tempMatrix);
}
/// <summary>
/// Creates a new <see cref="IJuggedMatrix{T}"/> matrix without row at <paramref name="rowIndex"/>
/// </summary>
/// <param name="juggedMatrix"></param>
/// <param name="rowIndex">Column index to remove</param>
/// <returns>A new <see cref="IJuggedMatrix{T}"/> matrix without row at <paramref name="rowIndex"/></returns>
public static IJuggedMatrix <T> CreateMatrixWithoutRow <T>(this IJuggedMatrix <T> juggedMatrix, int rowIndex)
{
if (ReferenceEquals(juggedMatrix, null))
{
throw new ArgumentNullException(nameof(juggedMatrix));
}
if (rowIndex < 0)
{
throw new ArgumentException("Row index is < 0");
}
if (rowIndex >= juggedMatrix.RowsCount)
{
throw new ArgumentException("Row index is out of range in matrix");
}
var tempMatrix = new T[juggedMatrix.RowsCount - 1][];
var currentRow = 0;
for (var i = 0; i < juggedMatrix.RowsCount; i++)
{
if (i == rowIndex)
{
continue;
}
var elementsInRow = juggedMatrix.ElementsInRow(i);
tempMatrix[currentRow] = new T[elementsInRow];
for (var j = 0; j < elementsInRow; j++)
{
tempMatrix[currentRow][j] = juggedMatrix[i, j];
}
currentRow++;
}
var newMatrix = new JuggedMatrix <T>(tempMatrix);
return(newMatrix);
}
/// <summary>
/// Returns the multiplication <see cref="IJuggedMatrix{T}"/> <paramref name="juggedMatrix"/> on <see cref="long"/>
/// <paramref name="number"/>
/// </summary>
/// <param name="juggedMatrix">First</param>
/// <param name="number"></param>
/// <returns>
/// New <see cref="IJuggedMatrix{T}"/> - the result multiplication of matrix <paramref name="juggedMatrix"/> on
/// <paramref name="number"/>
/// </returns>
public static IJuggedMatrix <long?> MulOnNumber(this IJuggedMatrix <long?> juggedMatrix, long number)
{
var newJuggedMatrix =
new JuggedMatrix <long?>(juggedMatrix.RowsCount,
juggedMatrix.CountOnEachRow()
.ToArray());
for (var i = 0; i < juggedMatrix.RowsCount; i++)
{
for (var j = 0; j < juggedMatrix.ElementsInRow(i); j++)
{
if (juggedMatrix[i, j] != null)
{
newJuggedMatrix[i, j] = juggedMatrix[i, j]
.Value
* number;
}
}
}
return(newJuggedMatrix);
}
