Hi Maria,

Thanks! I just happened to read this but normally don't read r-help. It is
best to send specific questions on not well known packages to the
maintainer directly.

The example on my website is hardcoded in the package. I should really also
add the option to make a legend like you want though. But what you could do
is create a dummy graph with the same parameters to get the color en width
of the lines and then just add that as a legend. The graphs are just base R
graphics so you could add a legend directly to it or plot it in a separate
panel using layout(), e.g.:

library("qgraph")

# Dummy plot to extract edge coloring:
g <-
qgraph(cbind(1:4,1:4,c(0.4,0.6,0.8,1)),esize=7,gray=TRUE,maximum=1.4,cut=0.0001,DoNotPlot=TRUE)
# Colors:
col <- g$graphAttributes$Edges$color
# lwd:
lwd <- g$graphAttributes$Edges$width

# Original plot:
qgraph(Edges2,esize=7,nsize=12,gray=TRUE,layout="circular",filetype="pdf",width=5,height=5,vsize=11,label.prop=1.2,arrows=FALSE,border.color=c("red","red","blue","green","purple"),border.width=4,maximum=1.4,cut=0.0001)

# Add legend:
legend("topright",legend=c(0.4,0.6,0.8,1),col=col,lwd=lwd,bty="n")

Best,
Sacha


---
Sacha Epskamp, MSc
Department of Psychological Methods
University of Amsterdam
Weesperplein 4, room 2.05
1018 XA Amsterdam
The Netherlands
http://www.sachaepskamp.com


2013/7/31 María Antonieta Sánchez Farrán <antosanf@gmail.com>

> Hello R community,
>
> I am creating some network representations using the qgraph package (big
> thanks to Sacha Epskamp for developing it!). The package is very well
> documented, but I am unable to find how to create a legend (scale) for edge
> thickness.  In one of his qgraph examples, Sacha shows such type of scale
> (fifth graph in http://sachaepskamp.com/qgraph/examples - scale for edge
> thickness relative to p-values). I have searched the documentation and it
> seems that a legend relates to the definition of node groups, so I am
> uncertain on which option/command I need to use for achieving what I need.
> I would also like to be able to select the values for which the scale is
> created too.
>
> If it is unclear, what I am looking for is to display this next to the
> network graph:
>
> probability     edge thickness
> 1.0           display line with thickness for 1.0
> 0.8           display line with thickness for 0.8
> 0.6           display line with thickness for 0.6
> 0.4           display line with thickness for 0.4
>
> My line of code for generating the network is the following:
>
> qgraph(Edges2,esize=7,nsize=12,gray=TRUE,layout="circular",filetype="pdf",width=5,height=5,vsize=11,label.prop=1.2,arrows=FALSE,border.color=c("red","red","blue","green","purple"),border.width=4,maximum=1.4,cut=0.0001)
>
> I would appreciate if somebody can help me out.
>
> Thanks,
> Maria Antonieta
>
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