protected BigRational multiplyRow(int index) throws UndefinedMultiplyException {
BigRational result = BigRational.ZERO;
for (int j = 0; j < size.col; j++) {
if (!array[index][j].isZero()) {
if (basis.getNewValue(j + position.col).isPositive()) {
result = result.add((array[index][j].multiply(basis.getNewValue(j + position.col))));
} else if (basis.getNewValue(j + position.col).isUndefined()) {
throw new UndefinedMultiplyException();
}
}
}
return result;
}
private BigRational multiplyBlockRow(BigRational[][] array, int index, int starting_col)
throws UndefinedMultiplyException {
BigRational result = BigRational.ZERO;
int cols = array[0].length;
for (int j = 0; j < cols; j++) {
if (!array[index][j].isZero()) {
if (basis.getNewValue(j + starting_col).isPositive()) {
result = result.add((array[index][j].multiply(basis.getNewValue(j + starting_col))));
} else if (basis.getNewValue(j + starting_col).isUndefined()) {
throw new UndefinedMultiplyException();
}
}
}
return result;
}
public void write(int row, int col, BigRational value) {
int block_row = row / rows_in_blocks;
int row_in_block = row % rows_in_blocks;
int block_col = col / cols_in_blocks;
int col_in_block = col % cols_in_blocks;
matrix[block_row][block_col][row_in_block][col_in_block] = value.copy(); // TODO copy?
}