R help - Jul 2003 - Plotting a graph of many lines between groups of points...

I have a data file read into a data frame.

For example,

	V1	V2	V3	V4
1	1	1	3	4
2	2	3	5	10
.	.	.	.	.
.	.	.	.	.
n          V1[n]     V2[n]     V3[n]     V4[n]

to n=many thousand

I want to plot a graph with many line segments, where v1[i]=x1, v2[i]=y1, 
v3[i]=x2, v4[i]=y2 for i=1,n.

This seems relatively simple in theory but I've spent quite a bit of time 
trying to make it happen with plot(type=), points(x,y), or lines(x,y) to no 
avail.

Do I need to turn these into vectors before plotting them?

Any help would be greatly appreciated.

Thanks,
Andrew

johnson.2060 at osu.edu wrote:
> I have a data file read into a data frame.
> 
> For example,
> 
>     V1  V2  V3  V4
> 1   1   1   3   4
> 2   2   3   5   10
> .   .   .   .   .
> .   .   .   .   .
> n          V1[n]     V2[n]     V3[n]     V4[n]
> 
> to n=many thousand
> 
is this stored as a data.frame? a matrix? In any case there seems to be
a problem with your indexing ...
> I want to plot a graph with many line segments, where v1[i]=x1,
v2[i]=y1, 
> v3[i]=x2, v4[i]=y2 for i=1,n.
indexing is ok if you have df$v3[i] ....
> 
> This seems relatively simple in theory but I've spent quite a bit of
time 
> trying to make it happen with plot(type=), points(x,y), or lines(x,y)
to no 
> avail.
could you send the actual code for your plot? Perhaps some way to
construct the data. at this point things are a bit
murky.
> 
> Do I need to turn these into vectors before plotting them?
Thus my question about how the data are stored...
> 
> Any help would be greatly appreciated.
> 
> Thanks,
> Andrew
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
Cheers, 
Joel


Joel F. Kincaid, Ph. D.
Assistant Professor
Department of Economics and Finance
Franklin P. Perdue School of Business
Salisbury University
Salisbury Maryland, 21801
Phone: (410) 548-4416
Email:   jfkincaid at salisbury.edu

johnson.2060 at osu.edu wrote:
 > I have a data file read into a data frame.
 >
 > For example,
 >
 >     V1  V2  V3  V4
 > 1   1   1   3   4
 > 2   2   3   5   10
 > .   .   .   .   .
 > .   .   .   .   .
 > n          V1[n]     V2[n]     V3[n]     V4[n]
 >
 > to n=many thousand
 >
is this stored as a data.frame? a matrix? In any case there seems to be 
a problem with your indexing ...
 > I want to plot a graph with many line segments, where v1[i]=x1, v2[i]=y1,
 > v3[i]=x2, v4[i]=y2 for i=1,n.
indexing is ok if you have df$v3[i] ....
 >
 > This seems relatively simple in theory but I've spent quite a bit of
time
 > trying to make it happen with plot(type=), points(x,y), or lines(x,y) 
to no
 > avail.
could you send the actual code for your plot? Perhaps some way to 
construct the data. at this point things are a bit murky.
 >
 > Do I need to turn these into vectors before plotting them?
Thus my question about how the data are stored...
 >
 > Any help would be greatly appreciated.
 >
 > Thanks,
 > Andrew
 >
 > ______________________________________________
 > R-help at stat.math.ethz.ch mailing list
 > https://www.stat.math.ethz.ch/mailman/listinfo/r-help

Cheers,
Joel

Joel F. Kincaid, Ph. D.
Assistant Professor
Department of Economics and Finance
Franklin P. Perdue School of Business
Salisbury University
Salisbury Maryland, 21801
Phone: (410) 548-4416
Email:   jfkincaid at salisbury.edu

Dear Andrew,

Assuming your variables are called V1 to V4, and are vectors, 
I'd use something like

plot(V1,V2,xlim=range(V1,V3),ylim=range(V2,V4),type="n")
segments(V1,V2,V3,V4)

HTH

Thomas

---

Thomas Hotz
Research Associate in Medical Statistics
University of Leicester
United Kingdom

Department of Epidemiology and Public Health
22-28 Princess Road West
Leicester
LE1 6TP
Tel +44 116 252-5410
Fax +44 116 252-5423

Division of Medicine for the Elderly
Department of Medicine
The Glenfield Hospital
Leicester
LE3 9QP
Tel +44 116 256-3643
Fax +44 116 232-2976

> -----Original Message-----
> From: Andrew Johnson [mailto:johnson.2060 at osu.edu]
> Sent: 15 July 2003 20:42
> To: r-help at stat.math.ethz.ch
> Subject: [R] Plotting a graph of many lines between groups of 
> points...
> 
> 
> I have a data file read into a data frame.
> 
> For example,
> 
> 	V1	V2	V3	V4
> 1	1	1	3	4
> 2	2	3	5	10
> .	.	.	.	.
> .	.	.	.	.
> n          V1[n]     V2[n]     V3[n]     V4[n]
> 
> to n=many thousand
> 
> I want to plot a graph with many line segments, where 
> v1[i]=x1, v2[i]=y1, 
> v3[i]=x2, v4[i]=y2 for i=1,n.
> 
> This seems relatively simple in theory but I've spent quite a 
> bit of time 
> trying to make it happen with plot(type=), points(x,y), or 
> lines(x,y) to no 
> avail.
> 
> Do I need to turn these into vectors before plotting them?
> 
> Any help would be greatly appreciated.
> 
> Thanks,
> Andrew
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
>