I have done a  plot which represents itemsets as vertices and rules as
directed edges between itemsets with this lines:

> plot(r1, method = "graph", measure = "confidence", shading = "lift")



When I try to do a plot which uses items and rules as two types of vertices
and edges indicate which items

occur in which rule, I use this lines:



>plot(r1, method="graph",control=list(type="items"))



Or



>plot(r1, method="graph",control=list(type="itemsets"))



But R shows this error message:



“Error in matrix(mean(range), ncol = ncol(x), nrow = nrow(x), dimnames =
dimnames(x)) :

  non-numeric matrix extent”



These are the items in r1:

 > inspect(items(r1))

> items

> 1 {X, Y}

> 2 {Z,W}

> 3 {X,T}

> 4 {R,U,W}

> 5 {R, U, W}

> I still don’t understand why it’s a matrix issue.




Muchas gracias.

Saludos,

Rodrigo Bastías C.
Estadístico PUC, Chile
http://www.mat.puc.cl/articulo94.html

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