Clear Filters
Clear Filters

Integration of a Series Sum

4 views (last 30 days)
Thomas
Thomas on 12 Dec 2012
I want to write a series sum in terms of a variable that I will integrate numerically:
syms q
fun = @(k) symsum(k*q,q,0,10)
integral(fun,0,1)
How can this be done?

Accepted Answer

Walter Roberson
Walter Roberson on 12 Dec 2012
Edited: Walter Roberson on 12 Dec 2012
sum(k*q,q,0,10) is going to be k * sum(q,q,0,10) which is going to be k * (10 * (10+1) / 2) which is going to be 45*k
integral(45*k, k, 0, 1) is going to be 45*k^2/2 evaluated at 1, which will be 45/2 .
Anyhow:
syms k q
fun = matlabFunction( symsum(k*q, q, 1, 10), 'vars', k);
and then integrate fun
  1 Comment
Thomas
Thomas on 12 Dec 2012
Unfortunately, the real series is rather more complicated, but thanks to your quick response, I hope Matlab will be able to handle it numerically. Thanks again.

Sign in to comment.

More Answers (0)

Community Treasure Hunt

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

Start Hunting!