calfrq

frequency response discretization

Calling Sequence

[frq,bnds,split]=calfrq(h,fmin,fmax)

Arguments

:h Linear system in state space or transfer representation ( `see

syslin`_ )

: :fmin,fmax real scalars (min and max frequencies in Hz) : :frq row vector (discretization of the frequency interval) : :bnds vector [Rmin Rmax Imin Imax] where Rmin and Rmax are the

lower and upper bounds of the frequency response real part, Imin and Imax are the lower and upper bounds of the frequency response imaginary part,

: :split vector of frq splitting points indexes :

Description

frequency response discretization; frq is the discretization of [fmin,fmax] such that the peaks in the frequency response are well represented.

Singularities are located between frq(split(k)-1) and frq(split(k)) for k>1.

Examples

s=`poly`_(0,'s')
h=`syslin`_('c',(s^2+2*0.9*10*s+100)/(s^2+2*0.3*10.1*s+102.01))
h1=h*`syslin`_('c',(s^2+2*0.1*15.1*s+228.01)/(s^2+2*0.9*15*s+225))
[f1,bnds,spl]=calfrq(h1,0.01,1000);
rf=`repfreq`_(h1,f1);
`plot2d`_(`real`_(rf)',`imag`_(rf)')

See Also

• bode Bode plot
• black Black-Nichols diagram of a linear dynamical system
• nyquist nyquist plot
• freq frequency response
• repfreq frequency response
• logspace logarithmically spaced vector