Finding max amplitude from cosine

 I want to  Experiment with diferent values for the forcing frequency w in F(t) = cos(wt). 
My goal is to fing the maximum range of values such that the maximum amplitude |y(t)> 1.

w1=0;
w2=0;
max =[w1,w2]; 
for w = -1:0.1:1
    t=0:1:100;
    f = cos(w.*t);
        if f>=1 
         max= w1;
        end
        if max>w1
           max= w2;
        end
    
end

[Rik]

It is considered rude to edit away your question. It removes the possibility for others to learn from your question (and the answer). You are getting free help from strangers on the internet, the least you can do is leave your question so other can benefit from it as well.

[Rena Berman]

(Answers Dev) Restored edit

Answer 1

[Daniel M]

The maximum amplitude of F(t) = A*cos(w*t) where A = 1, will always be 1, for all values of w. This doesn't require use of MATLAB at all, it is trivial to solve analytically.