Dear R-users,

I have just joint the list and much appreciate any thoughts on 2 issues.

Firstly, I want to reproduce some minimization results conducted in MATLAB. I have suceeded with nlm and optim-method CG. I have been told that I should get also with other optim methods. Actually, I found the same results when testing a very straightforward equation. However with a more complicated model it was not true. It is realy possible? Have I got it by chance in the simple case?

Secondly, in order to check which optimization is more suitable for our study, I would like to have the value of the minimized parameters on each iteration to later plot a "likelihood surface". However, for both nlm and optim, I could only keep the last iteration results. Is there a way to store/record the minimized values for each iteration? 

Sorry if these questions are reocuring. I have been searching for hints but did not get too far and I am fairly new to R.

Comments and examples are most  welcome.
Silvia Hadeler
 		
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