interpolation and numerical differentiation in R ?

See interpSpline in the splines library.

When evaluating the interpolating spline produced by interpSpline you
can specify that you want derivatives instead of the function value.

perfect.  I'd use predict.bSpline, it seems.

My problem was that I started looking in the wrong place. I was wandering
around the documentation on the web site, which I was unable to search
(pdf files).  Now that I've installed R, and can search I see that R has
an enormous number of functions which will be useful to me.  I didn't get
that impression from the 'Basics' book, though the book will be very
helpful as I get used to the data structures.

I think I'm going to like this language/package.

Thank you!

-Robert Merithew

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