/// <summary>
/// Combines matrix and vector column-wise. Vector is added to the end of the matrix
/// </summary>
/// <param name="m"></param>
/// <param name="v"></param>
/// <returns></returns>
public static StringMatrix CombineCols(this StringMatrix m, string[] v)
{
if (m.RowCount != v.Length)
{
throw new ArgumentException("matrix must have same number of rows as vector");
}
var rows = v.Length;
var cols = m.ColumnCount + 1;
var features = new string[rows * cols];
var matrixArray = m.Data();
var combineIndex = 0;
for (int i = 0; i < rows; i++)
{
var matrixIndex = i * m.ColumnCount;
Array.Copy(matrixArray, matrixIndex, features, combineIndex, m.ColumnCount);
var otherIndex = i;
combineIndex += m.ColumnCount;
Array.Copy(v, otherIndex, features, combineIndex, 1);
combineIndex += 1;
}
return(new StringMatrix(features, rows, cols));
}
/// <summary>
/// Converts StringMatrix to F64Matrix.
/// </summary>
/// <param name="stringMatrix"></param>
/// <param name="converter"></param>
/// <returns></returns>
public static F64Matrix ToF64Matrix(this StringMatrix stringMatrix,
Converter <string, double> converter)
{
var features = Array.ConvertAll(stringMatrix.Data(), converter);
return(new F64Matrix(features, stringMatrix.RowCount, stringMatrix.ColumnCount));
}
/// <summary>
/// Combines matrix1 and matrix2 column-wise. Matrix2 is added to the end of matrix1
/// </summary>
/// <param name="m1"></param>
/// <param name="m2"></param>
/// <returns></returns>
public static StringMatrix CombineCols(this StringMatrix m1, StringMatrix m2)
{
if (m1.RowCount != m2.RowCount)
{
throw new ArgumentException("matrices must have same number of rows in order to be combined");
}
var rows = m1.RowCount;
var columns = m1.ColumnCount + m2.ColumnCount;
var matrixArray = m1.Data();
var otherArray = m2.Data();
var features = new string[matrixArray.Length + otherArray.Length];
var combineIndex = 0;
for (int i = 0; i < rows; i++)
{
var matrixIndex = i * m1.ColumnCount;
Array.Copy(matrixArray, matrixIndex, features, combineIndex, m1.ColumnCount);
var otherIndex = i * m2.ColumnCount;
combineIndex += m1.ColumnCount;
Array.Copy(otherArray, otherIndex, features, combineIndex, m2.ColumnCount);
combineIndex += m2.ColumnCount;
}
return(new StringMatrix(features, rows, columns));
}
/// <summary>
///
/// </summary>
/// <param name="other"></param>
/// <returns></returns>
public bool Equals(StringMatrix other)
{
if (RowCount != other.RowCount)
{
return(false);
}
if (ColumnCount != other.ColumnCount)
{
return(false);
}
if (!Data().SequenceEqual(other.Data()))
{
return(false);
}
return(true);
}
/// <summary>
/// Combines matrix1 and matrix2 row-wise. Matrix2 is added to the end of matrix1
/// </summary>
/// <param name="m1"></param>
/// <param name="m2"></param>
/// <returns></returns>
public static StringMatrix CombineRows(this StringMatrix m1, StringMatrix m2)
{
if (m1.ColumnCount != m2.ColumnCount)
{
throw new ArgumentException("matrices must have same number of rows in order to be combined");
}
var rows = m1.RowCount + m2.RowCount;
var columns = m1.ColumnCount;
var matrixArray = m1.Data();
var otherArray = m2.Data();
var features = new string[matrixArray.Length + otherArray.Length];
Array.Copy(matrixArray, features, matrixArray.Length);
Array.Copy(otherArray, 0, features, matrixArray.Length, otherArray.Length);
return(new StringMatrix(features, rows, columns));
}
/// <summary>
/// Iterates over all elements in the matrix and applies the function to the elements.
/// The values are updated directly in the Matrix.
/// </summary>
/// <param name="matrix"></param>
/// <param name="func"></param>
public static void Map(this StringMatrix matrix, Func <string, string> func)
{
matrix.Data().Map(func);
}
/// <summary>
/// Converts StringMatrix to F64Matrix. This will fail if there are values not parsable as a double
/// </summary>
/// <param name="stringMatrix"></param>
/// <returns></returns>
public static F64Matrix ToF64Matrix(this StringMatrix stringMatrix)
{
var features = Array.ConvertAll(stringMatrix.Data(), FloatingPointConversion.ToF64);
return(new F64Matrix(features, stringMatrix.RowCount, stringMatrix.ColumnCount));
}