www.gusucode.com > rctobsolete 工具箱 matlab源码程序 > rctobsolete/robust/rdsigma.m
% SV = DSIGMA(A, B, C, D, TY, W, T) or % SV = DSIGMA(SS_,TY,W,Ts) % returns a matrix SV containing the discrete-time % singular value frequency response of the following % systems depending on the value of TY: % TY = 1 ---- G(exp(jwT)) % TY = 2 ---- inv(G(exp(jwT)) % TY = 3 ---- I + G(exp(jwT)) % TY = 4 ---- I + inv(G(exp(jwT))) % where G(z) is the frequency response of the % discrete system % x[n+1] = Ax[n] + Bu[n] % y[n] = Cx[n] + Du[n]. % % SS_ is a state-space system created by the % command SS_=MKSYS(A,B,C,D), W is a vector % of real frequencies at which the singular % values are evaluated, and T is the sampling % interval. % % The foregoing syntax is available when the % ROBUST CONTROL TOOLBOX is installed and is % in addition alternate syntaxes described in % the documentation for the function DSIGMA. % % See also DSIGMA, RSIGMA, SIGMA % RSIGMA.M for ROBUST CONTROL TOOLBOX % R. Y. Chiang & M. G. Safonov 9/30/96 % Copyright 1988-2004 The MathWorks, Inc. % All Rights Reserved. % ---------------------------------------------------------------------------