/// <summary>
/// C = A||B; Constructs a new matrix which is the concatenation of two other matrices.
/// </summary>
/// <param name="a">
/// The matrix A.
/// </param>
/// <param name="b">
/// The matrix B.
/// </param>
/// <returns>
/// The concatenation of A and B.
/// </returns>
public DoubleMatrix1D AppendColumns(DoubleMatrix1D a, DoubleMatrix1D b)
{
// concatenate
DoubleMatrix1D matrix = Make(a.Size + b.Size);
matrix.ViewPart(0, a.Size).Assign(a);
matrix.ViewPart(a.Size, b.Size).Assign(b);
return(matrix);
}
/// <summary>
/// Construct a matrix which is the concatenation of all given parts.
/// Cells are copied.
/// </summary>
/// <param name="parts">
/// The parts.
/// </param>
/// <returns>
/// A matrix.
/// </returns>
public DoubleMatrix1D Make(DoubleMatrix1D[] parts)
{
if (parts.Length == 0)
{
return(Make(0));
}
int size = 0;
for (int i = 0; i < parts.Length; i++)
{
size += parts[i].Size;
}
DoubleMatrix1D vector = Make(size);
size = 0;
for (int i = 0; i < parts.Length; i++)
{
vector.ViewPart(size, parts[i].Size).Assign(parts[i]);
size += parts[i].Size;
}
return(vector);
}
/// <summary>
/// Constructs a new matrix which is A duplicated <tt>repeat</tt> times.
/// </summary>
/// <param name="a">
/// The matrix to duplicate.
/// </param>
/// <param name="repeat">
/// The number of repetitions.
/// </param>
/// <returns>
/// A matrix.
/// </returns>
public DoubleMatrix1D Repeat(DoubleMatrix1D a, int repeat)
{
int size = a.Size;
DoubleMatrix1D matrix = Make(repeat * size);
for (int i = repeat; --i >= 0;)
{
matrix.ViewPart(size * i, size).Assign(a);
}
return(matrix);
}