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A general description is here.
For ‘nls()’, an optional constant ‘scaleOffset’ may be added to the denominator of the relative offset convergence test for cases where the fit of a model is expected to be exact, thanks to a proposal by John Nash.
‘sum(df)’ and similar ‘"Summary"’- and ‘"Math"’-group member functions now work for data frames ‘df’ with ‘logical’ columns, notably also of zero rows. Reported to R-devel by Martin "b706".