R help - Mar 2009 - : put grids in a plot at specific x points

Hi dear all!

I wonder if anybody can help me with this:

I have a plot:
 allchr <- read.table("allchrtog.txt",
header=F)
> attach(allchr)
> names(allchr)
[1] "V1" "V2" "V3"
"V4"
> plot(V1,V3, type="n")
> lines(V1,V3)

and I want to add grids to the plot but just at specific x points. So
for example, the first would be at 286.16 in the x axis.
Does anybody know how can I add these lines?

Thank you so much!

Laura

grid refers you to abline when"more fine tuning is required", i.e.  
when the situation is not a regular grid.

?abline

abline(v=286.16, lty="dotted")

If you had a vector, vec,  then this should do the trick:

abline(v=vec, lty="dotted")

-- 
David Winsemius
On Mar 16, 2009, at 4:25 PM, Laura Rodriguez Murillo wrote:
> Hi dear all!
>
> I wonder if anybody can help me with this:
>
> I have a plot:
> allchr <- read.table("allchrtog.txt", header=F)
>> attach(allchr)
>> names(allchr)
> [1] "V1" "V2" "V3" "V4"
>> plot(V1,V3, type="n")
>> lines(V1,V3)
>
>
> and I want to add grids to the plot but just at specific x points. So
> for example, the first would be at 286.16 in the x axis.
> Does anybody know how can I add these lines?
>
> Thank you so much!
>
> Laura
>
> ______________________________________________
> R-help at r-project.org 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.
David Winsemius, MD
Heritage Laboratories
West Hartford, CT

Thank you! that worked nicelly!

Laura

2009/3/16 David Winsemius <dwinsemius at
comcast.net>:
> grid refers you to abline when"more fine tuning is required",
i.e. when the
> situation is not a regular grid.
>
> ?abline
>
> abline(v=286.16, lty="dotted")
>
> If you had a vector, vec, ?then this should do the trick:
>
> abline(v=vec, lty="dotted")
>
> --
> David Winsemius
> On Mar 16, 2009, at 4:25 PM, Laura Rodriguez Murillo wrote:
>
>> Hi dear all!
>>
>> I wonder if anybody can help me with this:
>>
>> I have a plot:
>> allchr <- read.table("allchrtog.txt", header=F)
>>>
>>> attach(allchr)
>>> names(allchr)
>>
>> [1] "V1" "V2" "V3" "V4"
>>>
>>> plot(V1,V3, type="n")
>>> lines(V1,V3)
>>
>>
>> and I want to add grids to the plot but just at specific x points. So
>> for example, the first would be at 286.16 in the x axis.
>> Does anybody know how can I add these lines?
>>
>> Thank you so much!
>>
>> Laura
>>
>> ______________________________________________
>> R-help at r-project.org 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.
>
> David Winsemius, MD
> Heritage Laboratories
> West Hartford, CT
>
>