R help - Aug 2009 - draw n-1 lines with n X and n Y

I want to draw lines using a matrix with the X-axe on the first column, and
the the Y-axe on the second column.
These lines have to link the n points of a graph, so they are n-1, but the
resout using  these two commands:
		X <- matrix(scan("MaxInterEdges.R",0), ncol=2);
		lines(X[,1], X[,2], type = "l", col = "red");

is wrong, becose the lines are many more.

What can I do? 
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On Aug 25, 2009, at 12:15 PM, mirko86 wrote:
>
> I want to draw lines using a matrix with the X-axe on the first  
> column, and
> the the Y-axe on the second column.
> These lines have to link the n points of a graph, so they are n-1,  
> but the
> resout using  these two commands:
> 		X <- matrix(scan("MaxInterEdges.R",0), ncol=2);
> 		lines(X[,1], X[,2], type = "l", col = "red");
?segments

... but I am a bit confused, because you need both an X and a Y for  
each pair of points.
> is wrong, becose the lines are many more.
>
> What can I do?
You _could_ post reproducible code.

-- 

David Winsemius, MD
Heritage Laboratories
West Hartford, CT

Hi

r-help-bounces at r-project.org napsal dne 25.08.2009 18:15:25:
> 
> I want to draw lines using a matrix with the X-axe on the first column, 
and
> the the Y-axe on the second column.
> These lines have to link the n points of a graph, so they are n-1, but 
the
> resout using  these two commands:
>       X <- matrix(scan("MaxInterEdges.R",0), ncol=2);
>       lines(X[,1], X[,2], type = "l", col = "red");
> 
> is wrong, becose the lines are many more.
> 
> What can I do? 
Well, without reproducible code could help to identify a your problem. 
here is a guess

X[,1] is not ordered and the lines are connecting points as they appear in 
your data. You could order X by first column and then try to plot lines.

X.ord<-X[order(X[,1]),]
lines(X.ord[,1], X.ord[,2], col = "red")

Regards
Petr

> -- 
> View this message in context: 
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> and-n-Y-tp25137514p25137514.html
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> 
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