<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, parameter, new_value):
 """Try setting new parameter on ``block_matcher`` and update map."""

        try:
            self.block_matcher.__setattr__(parameter, new_value)
        except BadBlockMatcherArgumentError:
            return
        self.update_disparity_map()