How can I pass a transfer function tf() into fvtool() ?

Hi, I am try to pass different values of transfer faction into fvtool. But, I have a error said "FVTool does not accept cell arrays as inputs". I would like to plot the pole and zeros of a transfer function in (real vs. im plane). If I did it manually and create array, it will works just fine but I am looking to find a way to get these value directly from the transfer function.

     alpha_sweep = linspace(0.1,1,5);
     wn = 100;

     for x = 1:(length(alpha_sweep))
    
      alpha = alpha_sweep(x);
      H(x) = tf((142.857+(10000*alpha)),[alpha*1,140*alpha,alpha*wn^2]);

      fvtool((H(x).Denominator),(H(x).Numerator),'polezero')
      [b,a] = eqtflength(H(x).Denominator,H(x).Numerator);
      [z1,p1,k1] = tf2zp(H(x).Denominator,H(x).Numerator)
      text(real(z1)+.1,imag(z1),'Zero')
      text(real(p1)+.1,imag(p1),'Pole');

     end

Thanks,

Mohammed

Answer 1

[Davis]

I just found this question when I was searching for the same answer, You can convert the cell arrays to a matrix using cell2mat, i.e.:

fvtool(cell2mat(H(x).Numerator),cell2mat(H(x).Denominator),'polezero')

BTW, you reveresed the order of the numerator and denominator terms in fvtool.