Plot 3 lines in one graph

Mon, Nov 5, 2012 9:16 PM

matplot works just fine, but you only have two data points, at -4800 and at
-2800. You chop the x axis at -4500 so that the first point is outside the
graph window and extend it to -100 which is far beyond your point at -2800.
If you want to project the lines, you will have to add points.

+  -4800 25195.73 7415.219 7264.282
+ -2800 15195.73 5415.219 7264.28",
+  header=TRUE)

V1       V2       V3      V41
1 -4800 25195.73 7415.219 7264.282
2 -2800 15195.73 5415.219 7264.280

Did you want to use the two points to compute a slopes and intercepts for
lines and then plot those lines?

----------------------------------------------
David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Peter Alspach
Sent: Monday, November 05, 2012 10:41 PM
To: Ignacio Martinez; r-help
Subject: Re: [R] Plot 3 lines in one graph

Tena koe Ignacio

I cannot follow you example (you might care to read the posting guide,
link at end, to help you in this regard).  However, the usual way to
plot three lines in one graph is to use lines.  For example,

yourData <- data.frame(x=1:2, y1=runif(2), y2=runif(2), y3=runif(2))
with(yourData, plot(x, y1, ylim=range(unlist(yourData[,-1])),
type='l'))
with(yourData, lines(x, y2, col='red3'))
with(yourData, lines(x, y3, col='blue2', lty='dashed'))

I hope this is of some help ...

Peter Alspach

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
project.org] On Behalf Of Ignacio Martinez
Sent: Tuesday, 6 November 2012 12:10 p.m.
To: r-help
Subject: [R] Plot 3 lines in one graph

I'm new with R. I want to plot 3 lines in one graph. This is my data:

print(x)
     V1       V2       V3      V41 -4800 25195.73 7415.219 7264.282
-2800 15195.73 5415.219 7264.28

I tried using matplot, but I cannot get exactly what I want. This is
what I get, and this is my code:

matplot(x[,1],x[,-1],type='b', xlab = "epsilon_h",
        ylab = "Value2", xlim= range(-4500,-100),
        col = c("blue","green","red"), pch=1:3)
ex12 <- expression(V(h == 40),
                   V(h==20),
                   V(h==0))
legend("topright", ex12, col = c("blue","green","red"), pch=1:3)

I would like to make the lines extend so I can see the intersections.

The other, fancier and better looking, option that i found is ggplot2.
But for what I understand from the
example<http://wiki.stdout.org/rcookbook/Graphs/Scatterplots%20(ggplot2
)/>I
would need to reshape my data to something like this

     id       x       y      1     1     -4800   25195.73
2     1     -2800   15195.733     2     -4800   7415.2194     2
-2800   5415.2195     3     -4800   7264.286     3     -2800   7264.28

Thanks a lot for the help!

-Ignacio

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Plot 3 lines in one graph

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