[R] Need help with function that includes 2 summation
Romain Francois
rfrancois at mango-solutions.com
Wed Oct 17 14:35:49 CEST 2007
Zack Darnell wrote:
> I am relatively new to R, so this may be a much simpler question than
> it seems to me. I am trying to create a function that includes two
> summations, and can't figure out how. I am attaching the equation as a
> pdf file. This function will then be optimized over a chosen range of
> values, but right now I just need help with the function. Thank you.
> Zack Darnell
> Duke University
Hi,
I'm a bit unsure of what you call double summation, I only see the i
index in here, you can almost translate the latex code into R:
R> sqrt( sum(cos(k*theta))^2 + sum(sin(k*theta))^2 ) / n
theta being a vector containing all your theta_i, for i in 1 to n.
Cheers,
Romain
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