Nyquist Diagram Plotting -- octave_control_nyquist.m

octave_control_nyquist

Function: octave_control_nyquist ( num, den, min, max, n )

A Nyquist plot is a parametric plot of a transfer function.

function out=octave_control_nyquist( num, den, min, max, n )
 w = logspace( min, max, n  );
 s = polyval(num, complex(0, w))./polyval(den, complex(0, w));
 plot( real(s), imag(s) )
 out = "";
endfunction

>function g=G(s)
>g = 1./(1+s);
>endfunction 

> w = logspace( -2, 1, 100  ); 
> s = G(j.*w);  

> plot( real(s), imag(s) ) 

Function: [re, im, w] = nyquist ( sys )

Function: [re, im, w] = nyquist ( sys, w )

Nyquist diagram of frequency response.

See Also ...

• octave_control_bode.m

octave_control_nyquist.m

octave_control_nyquist