Peter Dalgaard reminded me to be more specific about my computing platform; it's Debian 4.1.1-19 on a 32-bit Pentium 4 machine (Dell Optiplex GX620).
The problem I described (nls not returning) also occurs with different data at other values of the scal parameter. Regards Hendrik Weisser -- ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel