titanium {DierckxSpline}R Documentation

titanium heat data

Description

49 values expressing a thermal property of titanium.

Usage

data(titanium)

Format

a data.frame with the following columns:

Details

Famous example used by de Boor and Rice (1968), Jupp (1978), Dierckx (1993) and perhaps others. (de Boor and Rice do not mention the source nor provide other information on the units or how the data were collected.)

Source

de Boor, C., and Rice, J. R. (1986), Least-squares cubic spline approximation. II: variable knots. Report CSD TR 21, Purdue U., Lafayette, IN. (available from http:// citeseer.ist.psu.edu/cache/papers/cs/24666/ ftp:zSzzSzftp.cs.wisc.eduzSzApproxzSztr21.pdf/ deboor68least.pdf; accessed 2008.07.22)

Dierckx, Paul (1993), Curve and Surface Fitting with Splines, Springer.

Jupp, D. L. B. (1975), Approximation to data by splines with free knots, SIAM Journal on Numerical Analysis, 15: 328-343.

Examples

data(titanium)
r <- curfit.free.knot(titanium$x2,
   titanium$y, g = 10, eps = 5e-4)
xyplot(r, show.knots = TRUE)


[Package DierckxSpline version 1.1-2 Index]