/**
* Internal function call that stores the result of a matrix multiply into the given
* destinationMatrix.
*
* @param multiplicationMatrix matrix to postmultiply this by
* @param destinationMatrix matrix to store the matrix multiplication result, must have rows ==
* this.getNumRows and columns == multiplicationMatrix.getNumColumns
*/
protected void timesInto(
final AbstractMTJMatrix multiplicationMatrix, AbstractMTJMatrix destinationMatrix) {
int M = this.getNumRows();
int N = multiplicationMatrix.getNumColumns();
if ((M != destinationMatrix.getNumRows()) || (N != destinationMatrix.getNumColumns())) {
throw new DimensionalityMismatchException("Multiplication dimensions do not agree.");
}
this.internalMatrix.mult(multiplicationMatrix.internalMatrix, destinationMatrix.internalMatrix);
}
/**
* Internal routine for storing a submatrix into and AbstractMTJMatrix. Gets the embedded
* submatrix inside of the Matrix, specified by the inclusive, zero-based indices such that the
* result matrix will have size (maxRow-minRow+1) x (maxColum-minCcolumn+1)
*
* @param minRow Zero-based index into the rows of the Matrix, must be less than or equal to
* maxRow
* @param maxRow Zero-based index into the rows of the Matrix, must be greater than or equal to
* minRow
* @param minColumn Zero-based index into the rows of the Matrix, must be less than or equal to
* maxColumn
* @param maxColumn Zero-based index into the rows of the Matrix, must be greater than or equal to
* minColumn
* @param destinationMatrix the destination submatrix of dimension
* (maxRow-minRow+1)x(maxColumn-minColumn+1)
*/
protected void getSubMatrixInto(
int minRow, int maxRow, int minColumn, int maxColumn, AbstractMTJMatrix destinationMatrix) {
if ((destinationMatrix.getNumRows() != (maxRow - minRow + 1))
|| (destinationMatrix.getNumColumns() != (maxColumn - minColumn + 1))) {
throw new DimensionalityMismatchException("Submatrix is incorrect size.");
}
for (int i = minRow; i <= maxRow; i++) {
for (int j = minColumn; j <= maxColumn; j++) {
destinationMatrix.setElement(i - minRow, j - minColumn, this.getElement(i, j));
}
}
}
