Thanks a lot for the hints. The sapply method may work for me. But how can I extract just the ".grad" expression from the return value of the deriv function? (and secondly store in a matrix of expressions?)
Thanks again. ______________________________________________ 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.
