[R] Odp: draw n-1 lines with n X and n Y

Petr PIKAL petr.pikal at precheza.cz
Wed Aug 26 11:44:25 CEST 2009


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, 
> 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 
> 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.

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


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