How to display a table and a graph for this code?

I want to show al the n iterations of this code in order to be shown in a table. Also I'd like to graph the result but I don't know how.

function I=trap(a,b,n,f)

function I=trap(a,b,n,f)
h = (b-a)/n ;
s = feval(f,a) ;
  for i=1:n-1
      x(i) = a + i*h ;
      s = s+2 * feval (f,x(i)) ;
    end
    s = s + feval(f,b) ;
    I = s*h/2 ;
%     fprintf('\nanswer is %11.6f=\n',I)
end

[Walter Roberson]

T = array2table(x.', 'VariableNames', {'x'});
plot(x)