How do I pull data from a FOR LOOP and save into vector.

This is what i have so far. I just cant seem to pull out the data from each run through the loop to compile a vector showing all values of K that satisfy each condition.

 % Problem #3 Transient response

 %   A). Write a loop to test integer values of K over the range of values       
 %       of K <= 200 that do not produce right-half-plane roots
 %   B). The loop should contain:
 %       i. Determine the closed-loop system poles using the "pole" command.
 %       ii. Test for an underdamped step response, using the "isreal" 
 %           command.
 %       iii. Store those values of K that produce an underdamped step 
 %           response in a vector. Display this vector in the Command Window.
 %       iv. Plot in Figure 2 (using the "figure" command) the unit step 
 %           response for the largest gain K that gives an underdamped step 
 %           response.
 %       v. Test for a critically-damped step response, using the "real" 
 %           and "isreal" command.
 %       vi. Store those values of K that produce a critically-damped step 
 %           response in a vector. Display this vector in the Command Window.
 %       vii. Plot in Figure 3 (using the "figure" command) the unit step 
 %           response for the gain K that gives a critically-damped step 
 %           response.
 %       viii. Test for an overdamped step response, using the real and 
 %           isreal command.
 %       ix. Store those values of K that produce an overdamped step 
 %           response in a vector. Display this vector in the Command Window.
 %       x. Plot in Figure 4 (using the "figure" command) the unit step 
 %          response for the smallest gain K that gives an overdamped step 
 %          response.

disp('Values of "K" that do NOT return RHP roots')
for k2=[1:1:200];
    G2=tf(k2*5,[1 10 -200]);
    Ge2=feedback(G2,1);
    p2=pole(Ge2)
    r2=real(p2);
    if max (r2) < 0;
        k2;
        fprintf('value of "k" = %1.1f \n',k2);
    end
end

[per isakson]

Add these two lines to the code

    K = nan( 1, 200 );
    K(k2)=k2;

Caveat: I didn't read all the comments