www.gusucode.com > ident 案例代码 matlab源码程序 > ident/ContinuousTimeTransferFunctionExample.m
%% Create a Continuous-Time Transfer Function Model % Specify a continuous-time, single-input, single-output (SISO) transfer % function with estimable parameters. The initial values of the transfer % function are: % % $$G(s) = \frac{{s + 4}}{{{s^2} + 20s + 5}}$$ % % % % Copyright 2015 The MathWorks, Inc. %% num = [1 4]; den = [1 20 5]; G = idtf(num,den); %% % |G| is an |idtf| model. |num| and |den| specify the initial values of % the numerator and denominator polynomial coefficients in descending powers % of $s$. The numerator coefficients having initial values 1 and 4 are estimable % parameters. The denominator coefficient having initial values 20 and 5 % are also estimable parameters. The leading denominator coefficient is % always fixed to 1. %% % You can use |G| to specify an initial parametrization for estimation with % |tfest|.