On Wed, 2009-04-15 at 12:02 -0400, Michael A. Miller wrote: > >>>>> "Manuel" == Manuel Morales <Manuel.A.Morales at williams.edu> writes: > > > nls(y ~ a[fac]*x^b, start=list(a=c(1,1), b=0.25)) > > Did you mean a[f]? > > nls(y ~ a[f]*x^b, start=list(a=c(1,1), b=0.25)) > > Mike Argh!!! -- http://mutualism.williams.edu