[R] plot portion of a line

[Dimitris Rizopoulos]

you could try something like the following:

x <- rnorm(50)
y <- rnorm(50)
obj <- lm(y ~ x)

par(mfrow = c(2, 2))
plot(x, y, main = "x < -1")
x. <- c(min(x), -1)
y. <- predict(obj, data.frame(x = x.))
lines(x., y.)

plot(x, y, main = "x > 1")
x. <- c(1, max(x))
y. <- predict(obj, data.frame(x = x.))
lines(x., y.)

plot(x, y, main = "x > -1 & x < 1")
x. <- c(-1, 1)
y. <- predict(obj, data.frame(x = x.))
lines(x., y.)


I hope it helps.

Best,
Dimitris

----
Dimitris Rizopoulos
Ph.D. Student
Biostatistical Centre
School of Public Health
Catholic University of Leuven

Address: Kapucijnenvoer 35, Leuven, Belgium
Tel: +32/(0)16/336899
Fax: +32/(0)16/337015
Web: http://med.kuleuven.be/biostat/
     http://www.student.kuleuven.be/~m0390867/dimitris.htm


----- Original Message ----- 
From: "BBands" <bbands at gmail.com>
To: "R-Help" <r-help at stat.math.ethz.ch>
Sent: Tuesday, January 16, 2007 5:16 PM
Subject: [R] plot portion of a line


> Dear HelpeRs,
>
> Given:
> x <- rnorm(50)
> y <- rnorm(50)
> plot(x,y)
> abline(lm(x ~ y))
>
> Is there a way to plot just a portion of the line? Say for values of 
> x
>> 2.0 or x > -2.0 and x < 4.0. (Still fitting all the points.)
>
> Thank you,
>
>    jab
> -- 
> John Bollinger, CFA, CMT
> www.BollingerBands.com
>
> If you advance far enough, you arrive at the beginning.
>
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide 
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 


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