public void add(double a, Matrix B) throws MatricksException {
if (B.numRows() != this.numRows() && B.numCols() != this.numCols()) {
throw new MatricksException("incompatible size for addition");
}
MatrixCursor cursor = B.cursor();
while (cursor.next()) {
final int row = cursor.row();
final int col = cursor.col();
double v = a * cursor.val() + this.get(row, col);
this.set(row, col, v);
}
}
/*
* simple generic implementation, can take advantage of sparsity structor
* of this matrix, but not the given one.
* @see org.genemania.engine.matricks.Matrix#elementMultiplySum(org.genemania.engine.matricks.Matrix)
*/
public double elementMultiplySum(Matrix m) {
double sum = 0d;
MatrixCursor cursor = this.cursor();
while (cursor.next()) {
sum += cursor.val() * m.get(cursor.row(), cursor.col());
}
return sum;
}