MATLAB: How does sum work

how does sum work?MATLAB

I don't understand what I'm doing wrong, it should be -1, but it turns out -0.5
but if you calculate separately for s=0 and s=1 and add it up, it turns out that -1 is true
clear
clc
n=2;
m=0;
k=(n-m)/2;
q=(n+m)/2;
r2=0;
s=0:k;
  R=sum((r2.^(n-(2.*(s)))).*...
     (((-1).^(s)).*(factorial(n-(s))))/...
     ((factorial(s)).*(factorial(q-(s))).*(factorial(k-(s)))))
also, if you can explain how to improve the formula so that it can be used when 
  r2=linspace(0,1,500);
if you can, write comments on actions in the response so that it is clear how your code works

Best Answer

you have one / operator that should be ./
Related Question