[R] French Curve
Marc Schwartz
MSchwartz at MedAnalytics.com
Fri Apr 1 19:46:23 CEST 2005
On Fri, 2005-04-01 at 17:00 +0200, Martyn Plummer wrote:
> 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.
http://mathworld.wolfram.com/FrenchCurve.html
Martyn,
My dad had one as well, along with his slide rule...then he later "moved
up" to a TI DataMath as I recall... ;-)
These days he is retired (was a medical school professor) and works on a
G5.
Best regards,
Marc
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