#NEWLINE# def nabsH( w , H ) : #NEWLINE# #INDENT# 'Computes the negative of the absolute value of H.\n\n    The computation is performed at the specified angular\n    frequency ``w``, on the unit circle.\n\n    This function is used by :func:`infnorm`.\n    ' #NEWLINE# z = np . exp ( ( 1j * w ) ) #NEWLINE# return ( - np . abs ( evalTF ( z , z ) ) )