[R] linear line in x, y plot

[David Winsemius]

On Oct 28, 2013, at 8:30 AM, Ahmed Attia wrote:

> Hi
>
> I have a question about drawing a linear line in x, y plot. I usually
> use the following code, but for this time the x values are to small
> (-0.08 to -0.02)

That is not the problem.

>
> I wrote the following code, but r does not draw the line. However, it
> does not give an error when it takes the code.
>
>
> reg1<- lm(CWSI~NWI, data=Ahmed)
>
> NWI <- seq(-0.08, -0.02, len = -0.02)

 >  seq(-0.08, -0.02, len = -0.02)
integer(0)

The length argument to seq doesn't make any sense. Please review:

?seq

--  
David
> lines(NWI, predict(reg1, list(NWI =
> NWI)),xlim=c(-0.08,-0.02),ylim=c(0,1),pch=1,col=1,lwd=2, lty=1)
>
> When I wrote the following code
>
> abline(reg1,pch=2,col=2,lwd=2,  
> lty=2,xlim=c(-0.06,-0.02),ylim=c(0.3,0.8))
>
> the line shows up, but I can not control the xlim or ylim. It bascally
> goes across the figure
>
> I appreciate your help
> -- 
> Ahmed M. Attia
>
>
> Research Assistant
> Dept. Of Soil&Crop Sciences
> Texas A&M University
> ahmed.attia at ag.tamu.edu
> Cell phone: 001-979-248-5215
>
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David Winsemius, MD
Alameda, CA, USA