while loop keeps running indefinitely

Why my code is not working? It keeps running indefinitely...

z0=[0.3 0.5 0.2];

test=0;

while test==0

     disp('checking');
     if exp(z0(2)*(1-z0(1)))<(1/z0(3))
         z0=z;
     else    
        r1 = 0 + (1-0).*rand(1,1);
        r2=  0 + (10-0).*rand(1,1);
        r3=  0 + (1-0).*rand(1,1);
        z0=[r1 r2 r3];

     end  
     test=0;
end

Answer 1

[James Tursa]

You never set test to anything other than 0, so the loop condition is always true.