[R] how to show iterations

Hi, I am new to R, and am working on some optimization problems - I was wondering if there was a way that I could show all the iterations in R -i.e. showing for each iteration, what the iteration is, how much the function is, what the norm of the gradient would be... Any help is greatly appreciated

Re: [R] how to show iterations

Hi Pieter, thank you for your response. I am indeed using the "optim" function. I had already tried the trace option under the control argument - however it only provides me with iteration no. 10, 20, 30 etc. I would like to be able to generate the results for every iteration. Here is an example

[R] summation sign

Hi all, I have a very quick question on how to use the summation sign in R for the function. 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

Re: [R] summation sign

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 Opt