/// <summary>
/// concatenate submatrices column-wise into one matrix, i.e., the number of rows for the output matrix
/// is equal to the number of rows of each of the frequency band matrices.
/// </summary>
public static double[,] ConcatFreqBandMatrices(List <double[, ]> submatrices)
{
// The assumption here is all frequency band matrices have the same number of columns.
int columnSize = submatrices.Count * submatrices[0].GetLength(1);
int rowSize = submatrices[0].GetLength(0);
double[,] matrix = new double[rowSize, columnSize];
int count = 0;
while (count < submatrices.Count)
{
matrix.AddToArray(submatrices[count], DoubleSquareArrayExtensions.MergingDirection.Column, submatrices[count].GetLength(1) * count);
count++;
}
// If we have frequency band matrices with different number of columns,
// Then the below commented code need to be used.
/*
* double[][,] submatrix = submatrices.ToArray();
* int colSize = 0;
* for (int i = 0; i < submatrix.Length; i++)
* {
* colSize = colSize + submatrix[i].GetLength(1);
* }
*
* // storing the number of rows of each submatrice in an array
* int[] noRows = new int[submatrix.Length];
* for (int i = 0; i < submatrix.Length; i++)
* {
* noRows[i] = submatrix[i].GetLength(0);
* }
*
* // find the max number of rows from noRows array
* int maxRows = noRows.Max();
*
* double[,] matrix = new double[maxRows, colSize];
*
* // might be better way to do this
* AddToArray(matrix, submatrix[0], "column");
* AddToArray(matrix, submatrix[1], "column", submatrix[0].GetLength(1));
* AddToArray(matrix, submatrix[2], "column", submatrix[0].GetLength(1) + submatrix[1].GetLength(1));
*/
return(matrix);
}
/// <summary>
/// convert a list of patch matrices to one matrix by row
/// patch matrices can have different row numbers but must have the same column number
/// </summary>
public static double[,] ListOf2DArrayToOne2DArray(List <double[, ]> listOfPatchMatrices)
{
int sumNumberOfPatches = 0;
foreach (var matrix in listOfPatchMatrices)
{
sumNumberOfPatches = matrix.GetLength(0) + sumNumberOfPatches;
}
double[,] allPatchesMatrix = new double[sumNumberOfPatches, listOfPatchMatrices[0].GetLength(1)];
int start = 0;
for (int i = 0; i < listOfPatchMatrices.Count; i++)
{
var m = listOfPatchMatrices[i];
allPatchesMatrix.AddToArray(m, DoubleSquareArrayExtensions.MergingDirection.Row, start);
start = m.GetLength(0) + start;
}
return(allPatchesMatrix);
}
