Vectorising a loop so does not contain any loops

Hi I have trouble vectorising a loop, currently I am stuck making the arrarys the same value, any help please?

for n = 1:100 
  for m = 1:100 

 A(n,m) = n^3 +m; 

        if A(n,m)<130 
       A(n,m)=3*A(n,m); 
        end
    end
end

x = 1:100;
y = 1:100;
[X,Y] = meshgrid(x,y);
F = X.^3 + Y ; 
 F = 3*(F(F<130)); % trouble is here 
disp(F);
isequal(A,F);

[Rena Berman]

(Answers Dev) Restored Question.

Answer 1

[Matt J]

I=F<130;
F(I) = 3*F(I);