<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def set_value(self, column, row, value):
 """Set the value of the Matrix at the specified column and row. :param integer column: The index for the column (starting at 0) :param integer row: The index for the row (starting at 0) :param numeric value: The new value at the given column/row :raise: Raises an :py:exc:`IndexError` if the index is out of xrange. """

        self.matrix[column][row] = value