thank you vm for the reply! Just to make things a little more complicated --does the equation hold even if the values of x are unknown? More specifically perhaps we can still refer to the made up example Sum(n equal 5)log(1-xi^2)
In the problem I am working on, I am writing a modified Newton Optimisation code with linesearch. Therefore the values of x are not given but each x variable is some nx1 vector ..e.g. lets take a 3x1 vector. So referring to this example, where we had to sum 5 times, how could I write the function such that it sums 5 times, but each of the 5 x variables is taken to be a 3x1 vector. thank you very much again! -- View this message in context: http://r.789695.n4.nabble.com/summation-sign-tp4647621p4647655.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
