gainplot

Scilab Function
Last update : 25/04/2007

gainplot - magnitude plot

### Calling Sequence

  `gainplot(sl,fmin,fmax [,step] [,comments] )`
  `gainplot(frq,db,phi [,comments])`
  `gainplot(frq, repf [,comments])`

### Parameters

- `sl` : list (`syslin` SIMO linear system).
- `fmin,fmax` : real scalars (frequency interval).
- `step` : real (discretization step (logarithmic scale))
- `comments` : string
- `frq` : matrix (row by row frequencies)
- `db,phi` : matrices (magnitudes and phases corresponding to `frq` )
- `repf` : complex matrix. One row for each frequency response.

### Description

Same as Bode but plots only the magnitude.

### 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))
    gainplot(h,0.01,100,'(s^2+2*0.9*10*s+100)/(s^2+2*0.3*10.1*s+102.01)')
    clf()
    h1=h*syslin('c',(s^2+2*0.1*15.1*s+228.01)/(s^2+2*0.9*15*s+225))
    gainplot([h1;h],0.01,100,['h1';'h'])

### See Also

`bode` , `black` , `nyquist` , `freq` , `repfreq` , `g_margin` , `p_margin` ,