how can I return vector to GUI?

Hi,

I have this function and I want to do a GUI for it. The only problem I am facing is U vector; how can I display the matrix U in GUI? should I use regular textbox or any other? Note that the size of U will be changing later depends on the size of x.

 function [k,U]=test1(x)
 format rat  % change decimal into fractional numbers
 for i=1:size(x,2) 
    [Num(i), Den(i)] = numden(sym(x(i))); % Num of simplest form of x
 end
 Max1  = max([Num(:);Den(:)]);
 Min1  = min([Num(:);Den(:)]);
 k = max(Max1, abs(Min1)); % get max of abs values of the two 
 Y = [1 5;3 4]; L = [1 k;1 1]; U = Y.*L;
 end