[R] Smooth line in graph

[Greg Snow]

Try:

> lines(spline(x,y, method='n', n=250))

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Nestor Fernandez
> Sent: Wednesday, September 19, 2007 2:09 PM
> To: r-help at stat.math.ethz.ch
> Subject: [R] Smooth line in graph
> 
> Hi,
> 
> I'm trying to get smooth curves connecting points in a plot 
> using "spline" but I don't get what I whant.
> 
> Eg.:
> x<-1:5
> y <- c(0.31, 0.45, 0.84, 0.43, 0.25)
> plot(x,y)
> lines(spline(x,y))
> 
> Creates a valley between the first and second points, then 
> peaks at 3rd, and another valley between 4th and 5th. I'm 
> trying to get a consistently growing curve up to the 3rth 
> point and then a decrease like with SigmaPlot spline curves 
> or with Excel.
> 
> I tried with different spline arguments and also lowess and 
> loess, with no success. Any ideas?
> 
> Thanks.
> 
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