This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English version of the page.

Note: This page has been translated by MathWorks. Click here to see
To view all translated materials including this page, select Country from the country navigator on the bottom of this page.


Titanium test data


[x,y] = titanium


[x,y] = titanium returns measurements of a certain property of titanium as a function of temperature. Since their use in [1], 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.


The plot of the data shown below is generated by the following commands:

[x,y] = titanium; plot(x,y,'ok'), set(gca,'Fontsize',16) 


[1] C. de Boor and J. R. Rice. "Least squares cubic spline approximation II - Variable knots." CSD TR 21, Comp.Sci., Purdue Univ., April 1968.