National Instruments 370757C-01 用户手册

Figure 3-2.  Singular Values of H(j

ω) as a Function of ω

sv

 is returned in dBs. Check that 

sigma

 is within 0.01 (the default value of 

tol

) of 

10**(max(sv,{channels})/20)

.

[sigma,10^(max(sv,{channels})/20)]

The 

linfnorm( )

 function also can be used on discrete-time systems. 

Consider a state-space system with a sample rate of 10 Hz:

SysD=system([0.5,0.5;0.8,0.5],[0.8,0.5]',

[0,1],0,{dt=0.1})

[sigma,omega]=linfnorm(SysD)