Can anyone tell me the error with sum function?

3 views (last 30 days)
r=0.5;
n=0:10;
x=r.^n
s=sum(x)
What's the error with s?
  3 Comments
Alex Mcaulley
Alex Mcaulley on 11 Dec 2019
What is wrong? It is the summation of a geometric progression and the result seems ok:
%Your code
r=0.5;
n=0:10;
x=r.^n
s=sum(x)
%General formula
s2 = x(1) + r*(x(end)-1)/(r-1)
s =
1.9990
s2 =
1.9990

Sign in to comment.

Answers (1)

Steven Lord
Steven Lord on 11 Dec 2019
Based on prior experience, I suspect you received the error "Array indices must be positive integers or logical values." If that's the case, clear the variable you've created named sum which is preventing you from calling the built-in sum function.

Tags

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!