[R] summation sign

sffarooqi sffarooqi at gmail.com
Sat Oct 27 01:34:15 CEST 2012

Hi all,
I have a very quick question on how to use the summation sign in R for the
Here´s a basic example: the function is sum(i=1 to 5)log(1-xi^2)
Id be grateful if someone knows how to do this without writing it out 5
times - I am looking sth along the lines of  the following:

computeR <- function(x)
    return (-sum(log(1-x^2))
thank you vm in advance!

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