Re: [R] Advise in R- plotting graphs

From: Ista Zahn <istazahn_at_gmail.com>
Date: Sat, 24 May 2008 13:07:22 -0400

>
>
> From: "Jason Lee" <huajie.lee_at_gmail.com>
> Date: May 23, 2008 10:06:18 AM EDT
> To: r-help_at_r-project.org
> Subject: [R] Fwd: Advise in R- plotting graphs
>
>
> Hi
>
> I tried and it is not what im looking ..
>
> I basically issue plot(data$"V1",data$"V2") as the matrix have the two
> headers..But essentially what I would like is relabel or somehow
> differentiate row 5 from the rest of the points on the graph.

If I understand correctly what you want the code provided by Jim Holtman works provided you omit the " type = "l" " part. If you convert the matrix to a data frame you can use the ggplot2 package to do this kind of thing very flexibly (see code below)
>
>
> In other words, I wanted to see all the points but at the same time
> see the
> particular point (row 5 in this case) on the graph as another point
> of color
> in the graph.
>
> Please advise.
>
> Thanks.,
>
>
>
> On Fri, May 23, 2008 at 11:00 PM, jim holtman <jholtman_at_gmail.com>
> wrote:
>
>> try this:
>>
>> x <- matrix(runif(15, 100, 300), ncol=3)
>> plot(x[,1], x[,2], type='l')
>> points(x[5,1], x[5,2], pch=17, cex=3, col='red') # plot point #5

#Alternative solution using ggplot2#
x2 <- data.frame(x)
x2$factor <- factor(c(1,1,1,1,2))
library(ggplot2)
qplot(X1,X2, data=x2, colour=factor)

>>
>>
>> On Fri, May 23, 2008 at 8:50 AM, Jason Lee <huajie.lee@gmail.com>
>> wrote:
>>
>>> Hi
>>>
>>> I have a data table matrix,"data" which looks like below:-
>>> V1 V2 V3
>>> 1 -6382.719 -1096.554 6998994
>>> 2 -some values-
>>> 3 -some values-
>>> 4 -some values-
>>> 5 -some values-
>>>
>>> Querying dim of "data" gives me 3 columns and 5 rows.
>>>
>>> And currently I want to plot "V1" against "V2" with the condition
>>> that I
>>> want to mark(color) the point(row 5) on the graph. This is so i
>>> could see
>>> some triangle shape thing on the graph for row 5.
>>>
>>> I couldnt recall how I could use repo() to change the line 5 to
>>> some value
>>> to differentiate with others. And then using PCH for the color.
>>>
>>> Please advise. Thanks.
>>>
>>> -jason
>>>
>>> [[alternative HTML version deleted]]
>>>
>>> ______________________________________________
>>> 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<http://www.r-project.org/posting-guide.html
>>> >
>>> and provide commented, minimal, self-contained, reproducible code

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