www.gusucode.com > signal 案例源码程序 matlab代码 > signal/StepResponseOfAButterworthFilterstepzExample.m
%% Step Response of a Butterworth Filter % Create a third-order Butterworth filter with normalized half-power % frequency $0.4\pi$ rad/sample. Display its step response. % Copyright 2015 The MathWorks, Inc. %% [b,a] = butter(3,0.4); stepz(b,a) grid %% % Create an identical filter using |designfilt| and display its step % response using |fvtool|. d = designfilt('lowpassiir','FilterOrder',3,'HalfPowerFrequency',0.4); stepz(d)