French Curve
On Fri, 2005-04-01 at 09:30 +0200, Martin Maechler wrote:
"dream" == dream home <dreamhouse at gmail.com>
on Wed, 30 Mar 2005 12:27:08 -0800 writes:
dream> Dear R experts, Did someone implemented French Curve
dream> yet? Or can anyone point me some papers that I can
dream> follow to implement it?
Are you talking about "splines" ?
I vaguely remember having read that in the distant past, splines
were sometimes called "French curves".
I found this: G. Wahba and S. Wold, "A completely automatic french curve: Fitting splines by cross validation," Commun. Statist., vol. 4, no. 1, pp. 1-17, 1975. I remember that my father had a French curve: it was a plastic template used for drawing which had several smooth edges of varying curvature. You could use it to draw a wide variety of curved shapes. No doubt the French called it something else.
There's lots of splines functionality in the basic 'stats'
package, in the recommended 'mgcv' package and even more in
quite a few other packages.
dream> thanks in advance for your help.
You're welcome,
Martin Maechler, ETH Zurich