fvtool(H) performs an analysis and computes the magnitude response of the filter System object™ H.
fvtool(H,'Arithmetic',ARITH,...) analyzes the filter System object H, based on the arithmetic specified in the ARITH input. ARITH can be set to one of 'double', 'single', or 'fixed'. The analysis tool assumes a double precision filter when the arithmetic input is not specified and the filter System object is in an unlocked state. The 'Arithmetic' input is only relevant for the analysis of filter System objects.