Problem finding sum of array using vectorization

1 view (last 30 days)
Jade March
Jade March on 15 Dec 2021
Edited: James Tursa on 15 Dec 2021
Trying to find the sum of this array using vectorization, the value of the sum should be 0.74 but when I run it I am getting 'ans = -Inf'. Where am I going wrong?
x = sym(1) ./ (1:9)
1 - sum( +1./((x)-1) ./ x )

Answers (1)

James Tursa
James Tursa on 15 Dec 2021
The first element of x is 1, so that element produces 1/(1-1) = 1/0 = inf in the second line. You need to rewrite that second line.
  2 Comments
James Tursa
James Tursa on 15 Dec 2021
You just need a vector that alternates +1, -1, +1, -1, etc. to use for the sign, right? Hint: Start with mod(1:9,2) and see if you can manipulate it into what you want.

Sign in to comment.

Community Treasure Hunt

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

Start Hunting!