How to save each loop data?

I am new to matlab so please bear with me. I am trying to show how y varies with the different u values. And im trying to to display that in a figure. But i dont seem get the saved data from the loop. Any suggestions?

c=3e8; %speed of light
u=0;

while u<(c)
    
  y=1/(sqrt(1-((u^2)/(c^2))));
  u=u+(0.01*c);
  
end

plot(u, y,'r')

Answer 1

[Asad (Mehrzad) Khoddam]

You can make a vector of points as here:

c=3e8; %speed of light
u=0;
uv=[];
yv=[];
while u<(c)
    
  y=1/(sqrt(1-((u^2)/(c^2))));
  u=u+(0.01*c);
  uv=[uv u];
  yv=[yv y];
  
  
end
plot(uv, yv,'r')