> Sent: Friday, April 06, 2018 at 5:55 AM > From: "David Winsemius" <dwinsem...@comcast.net> > > > Not correct. You already have `predict`. It is capale of using the `newdata` > values to do interpolation with the values of the coefficients in the model. > See: > > ?predict >
The ยง details did not mention interpolation explicity; thanks. > The original question asked for a derivative (i.e. a "gradient"), but so far > it's not clear that you understand the mathematical definiton of that term. > We also remain unclear whether this is homework. > The motivation of this post was simple differentiation of a tangent point (dy/dx) manually, then wondering how to re-think in modern-day computing terms. Hence the original question about asking the appropriate functions/syntax to read further ("curiosity"), not the answer (indeed, "homework"). :) Personal curiosity should be considered "homework". ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.