how to print only a subset

Hello

Following code gives a big output. All I wanna do is to print just the values na and nb

Is there a way I can do it please?

code:

% Create an ARX model for generaing data:
A = [1 -1.5 0.7]; B = [0 1 0.5];
m0 = idpoly(A,B);
% Generate a random input signal:
u = iddata([],idinput(400,'rbs'));
e = iddata([],0.1*randn(400,1));
% Simulate the output signal from the model m0:
y = sim(m0, [u e]);
z = [y,u]; % analysis data
NN = struc(1:5,1:5,1);
V = arxstruc(z(1:200),z(201:400),NN);
nn = selstruc(V,0);
m = arx(z,nn);

output:

Discrete-time ARX model:  A(z)y(t) = B(z)u(t) + e(t)
  A(z) = 1 - 1.495 z^-1 + 0.6957 z^-2               

    B(z) = 1.001 z^-1 + 0.5032 z^-2                   

Sample time: 1 seconds

Parameterization:
Polynomial orders:   na=2   nb=2   nk=1
   Number of free coefficients: 4
   Use "polydata", "getpvec", "getcov" for parameters and their uncertainties.

Status:                                         
Estimated using ARX on time domain data "z".    
Fit to estimation data: 97.7% (prediction focus)
FPE: 0.009155, MSE: 0.008998                    
>> aaaa
>> m

m =
Discrete-time ARX model:  A(z)y(t) = B(z)u(t) + e(t)
  A(z) = 1 - 1.594 z^-1 + 0.8409 z^-2 - 0.0653 z^-3 

    B(z) = 1.001 z^-1 + 0.4118 z^-2 - 0.04818 z^-3    

Sample time: 1 seconds

Parameterization:
Polynomial orders:   na=3   nb=3   nk=1
   Number of free coefficients: 6
   Use "polydata", "getpvec", "getcov" for parameters and their uncertainties.

Status:                                          
Estimated using ARX on time domain data "z".     
Fit to estimation data: 97.82% (prediction focus)
FPE: 0.01091, MSE: 0.01062