Titanium Test Data

The Titanium data set describes measurements of a certain property of titanium as a function of temperature.

data(titanium)

Format

The format is:
Two columns called `x' and `y', the first being the temperature.

Details

These data have become a standard test for data fitting since they are hard to fit by classical techniques and have a significant amount of noise.

Source

Boor, C. de, and J. R. Rice (1968). Least squares cubic spline approximation II – Variable knots, CSD TR 21, Comp.Sci., Purdue Univ.

Examples

if (FALSE) { # \dontrun{
data(titanium)
plot(titanium)
grid()} # }