The optim function has a debug option called trace see the helppage: trace Non-negative integer. If positive, tracing information on the progress of the optimization is produced. Higher values may produce more tracing information: for method "L-BFGS-B" there are six levels of tracing. (To understand exactly what these do see the source code: higher levels give more detail.)
for Nelder-Mead this outputs quite a bit of information. You would only need more if you were debugging optim, as a user if you think visualizing how the damned thing walks will help you understand your problem better, you are probably onto the wrong path. That said, you seem to have data which is defined on a grid, the appropriate method in this case in SANN, not Nelder-Mead. Hope this helps, K ----------------------------------------------- Nanjing University tel: +8625 8622 8040 (h) +86 13451911944 (m) ______________________________________________ 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.
