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See the recommended documentation of this function

# calfrq

frequency response discretization

### Syntax

`[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)')```

• bode — Bode plot
• black — Black-Nichols diagram of a linear dynamical system
• nyquist — nyquist plot
• freq — frequency response
• repfreq — frequency response
• logspace — вектор с интервалами между элементами в логарифмическом масштабе