[R] plot portion of a line

[Gabor Grothendieck]

Use segments. In the following we overlay the black abline with
a wider red segments line segment:


set.seed(1)
x <- rnorm(50)
y <- rnorm(50)

plot(y ~ x)

y.lm <- lm(y ~ x)

abline(y.lm) # omit this line if black abline not wanted

x0 <- c(-2, 4)
y0 <- predict(y.lm, list(x = x0))
segments(x0[1], y0[1], x0[2], y0[2], col = "red", lwd = 2)



On 1/16/07, BBands <bbands at gmail.com> wrote:
> 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.
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