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2008 Aug 29
1
nls() fails on a simple exponential fit, when lm() gets it right?
...eight))
cat("(Starting values for the logarithmic fit were: aaa=",tmp[1],"and
bbb=",tmp[2],")\n")
modelfit=nls(height~SSlogarithmic(x=dbh,aaa,bbb),trace=traceson,control=list(maxiter=maxint,tol=tolerance,minFactor=minstepfactor))
bfaaa=summary(modelfit)$coefficients[1];bfbbb=summary(modelfit)$coefficients[2]
cat("Best logarithmic fit is (",ytxt,")=(aaa*log(",xtxt,")+bbb) with
parameters aaa=",bfaaa,"and bbb=",bfbbb,"\n")
#Produces: Best logarithmic fit is ( Height in m )=(aaa*log( DBH in mm
)+bbb) with parameters aaa= 7...