Having trouble getting the plot

so I am having trouble getting this to display. I will be changing the value of big N to different values but I can't even get this to display properly. Im not sure what I am doing wrong here can anybody help

 N = 1;
 n = 0:1:150;
 amplitude = (N.^n)*exp(-N)/(factorial(n))
 plot(n,amplitude);

Answer 1

[Azzi Abdelmalek]

factorial(n) is an array then you have to use ./ instead of /

amplitude = (N.^n)*exp(-N)./(factorial(n))