/// <summary>
/// Creates a new view in which the columns of the matrix (but not the column keys) are permuted.
/// This is a 'view' in the sense that changes to the values in either matrix will be reflected in both.
/// </summary>
/// <typeparam name="TRowKey">The type of the row key. Usually "String"</typeparam>
/// <typeparam name="TColKey">The type of the col key. Usually "String"</typeparam>
/// <typeparam name="TValue">The type of the value, for example, double, int, char, etc.</typeparam>
/// <param name="parentMatrix">The matrix to wrap.</param>
/// <param name="colIndexSequence">The indexes of the columns in their new order. Every col index must be mentioned exactly once.</param>
/// <remarks>If the permutation puts every column back in the same place, the parent matrix is returned.</remarks>
/// <returns>A new matrix with permuted columns.</returns>
static public Matrix <TRowKey, TColKey, TValue> PermuteColValuesForEachRowView <TRowKey, TColKey, TValue>(this Matrix <TRowKey, TColKey, TValue> parentMatrix, IEnumerable <int> colIndexSequence)
{
//If the new won't change anything, just return the parent
if (colIndexSequence.SequenceEqual(Enumerable.Range(0, parentMatrix.ColCount)))
{
return(parentMatrix);
}
//!!!Could check of this is a PermuteValuesView of a PermuteValuesView and simplify (see TransposeView for an example)
var matrixView = new PermuteValuesView <TRowKey, TColKey, TValue>();
matrixView.SetUp(parentMatrix, colIndexSequence);
return(matrixView);
}
/// <summary>
/// Creates a new view in which the columns of the matrix (but not the column keys) are permuted.
/// This is a 'view' in the sense that changes to the values in either matrix will be reflected in both.
/// </summary>
/// <typeparam name="TRowKey">The type of the row key. Usually "String"</typeparam>
/// <typeparam name="TColKey">The type of the col key. Usually "String"</typeparam>
/// <typeparam name="TValue">The type of the value, for example, double, int, char, etc.</typeparam>
/// <param name="parentMatrix">The matrix to wrap.</param>
/// <param name="colIndexSequence">The indexes of the columns in their new order. Every col index must be mentioned exactly once.</param>
/// <remarks>If the permutation puts every column back in the same place, the parent matrix is returned.</remarks>
/// <returns>A new matrix with permuted columns.</returns>
static public Matrix<TRowKey, TColKey, TValue> PermuteColValuesForEachRowView<TRowKey, TColKey, TValue>(this Matrix<TRowKey, TColKey, TValue> parentMatrix, IEnumerable<int> colIndexSequence)
{
//If the new won't change anything, just return the parent
if (colIndexSequence.SequenceEqual(Enumerable.Range(0, parentMatrix.ColCount)))
{
return parentMatrix;
}
//If this is a permutation of a permutation, simplify
PermuteValuesView<TRowKey, TColKey, TValue> parentPermuteValuesViewOrNull = parentMatrix as PermuteValuesView<TRowKey, TColKey, TValue>;
if (null != parentPermuteValuesViewOrNull)
{
var colIndexSequenceTwo = colIndexSequence.Select(i => parentPermuteValuesViewOrNull.IndexOfParentCol[i]);
var matrixView = new PermuteValuesView<TRowKey, TColKey, TValue>();
matrixView.SetUp(parentPermuteValuesViewOrNull.ParentMatrix, colIndexSequenceTwo);
return matrixView;
}
else
{
var matrixView = new PermuteValuesView<TRowKey, TColKey, TValue>();
matrixView.SetUp(parentMatrix, colIndexSequence);
return matrixView;
}
}
