I was able to get the library command to execute after I uninstalled
graphviz 2.28.0 and instead installed 2.20.3.1.  However, when I execute the
following example from the documentation, R crashes:

library("Rgraphviz")
set.seed(123)
V <- letters[1:10]
M <- 1:4
g1 <- randomGraph(V, M, 0.2)
plot(g1)


On Tue, Sep 20, 2011 at 4:24 PM, Jayanth Rajan <jayanthrajan@gmail.com>wrote:

> I have installed graphviz 2.28.0 on a Windows 7 machine and Rgraphviz
> 1.30.1.  The command library(Rgraphviz) in R throws a message box stating
> that libcdt-4.dll is missing.  The folder C:\Program
> Files\Graphviz2.28.0\bin does not contain this DLL.  What is the version of
> graphviz that is compatible with Rgraphviz 1.30.1?
>
>

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