# [R] An empty grey diagram

Stephen Liu satimis at yahoo.com
Sat Nov 20 09:12:07 CET 2010

```Hi Josh and David,

Problem solved.

Both following steps work.

1)
> ToothGrowth
> attach(ToothGrowth)
> plot(dose,len)   # this step is needed.  Don't close the diagram.  Otherwise
>following command won't work.

> matrics=lm(len~dose)
> abline(matrics)

Graph displayed

2)
> ToothGrowth
> attach(ToothGrowth)
> plot(dose, len)   # this step is needed.  Don't close the diagram.  Otherwise
>following command won't work.

> abline(lm(len ~ dose, data = ToothGrowth))

Graph displayed

B.R.
Stephen L

----- Original Message ----
From: Joshua Wiley <jwiley.psych at gmail.com>
To: Stephen Liu <satimis at yahoo.com>
Cc: r-help at r-project.org
Sent: Sat, November 20, 2010 1:39:45 PM
Subject: Re: [R] An empty grey diagram

On Fri, Nov 19, 2010 at 9:35 PM, Stephen Liu <satimis at yahoo.com> wrote:
> Hi David,
>
>
>> What happens when you follow the directions... i.e. type:
>> plot.new()    #???
>
> abline(lm(len ~ dose, data = ToothGrowth))
> plot.new()
>
> The grey background changes to white, still an empty graph

You cannot just use abline() on an empty graphic (well, you can but
you get an empty graph).  Please actually run my code, it will create
a scatter plot, then add a line.  Do not close the graphic device in
between.

with(ToothGrowth, plot(dose, len))
abline(lm(len ~ dose, data = ToothGrowth))

```