Hello,

I'm getting the same error others have gotten with Rgraphviz (v 1.27.0), but the previously posted solutions don't seem to be working:

> library(Rgraphviz)
Error : .onLoad failed in loadNamespace() for 'Rgraphviz', details:
  call: value[[3L]](cond)
  error: unable to load shared object 'C:/Users/ckingsley.TGEN/Documents/R/win-library/2.13/Rgraphviz/libs/x64/Rgraphviz.dll':
  LoadLibrary failure:  %1 is not a valid Win32 application.


  Check that (1) graphviz is installed on your system; (2) the installed version of graphviz matches '2.20.3'; this is the version used to build this Rgraphviz package; (3) graphviz is accessible to R, e.g., the
  path to the graphviz 'bin' directory is in the system 'PATH' variable.  See additional instructions in the 'README' file of the Rgraphviz 'source' distribution, available at

  http://bioconductor.org/packages/release/bioc/html/Rgraphviz.html

  Ask further questions on the Bioconductor mailing list

  http://bioconductor.org/docs/mailList.html


Error: package/namespace load failed for 'Rgraphviz'



I have installed graphviz 2.20.3.1 and the PATH environmental variable contains the path to the bin directory:

> grep("Graphviz", strsplit(Sys.getenv("PATH"), ";")[[1]], value=T)
[1] "C:\\Program Files (x86)\\Graphviz2.20\\bin<file:///\\Graphviz2.20\bin>"

> list.files("C:\\Program Files (x86)\\Graphviz2.20\\bin<file:///\\Graphviz2.20\bin>")
[1] "acyclic.exe"                    "bcomps.exe"                     "ccomps.exe"                     "circo.exe"                      "comdlg32.ocx"                   "diffimg.exe"                    "dijkstra.exe"
 [8] "dot.exe"                        "dot2gxl.exe"                    "dotty.exe"                      "fc-cache.exe"                   "fc-cat.exe"                     "fc-list.exe"                    "fc-match.exe"
[15] "fdp.exe"                        "gc.exe"                         "gv2gxl.exe"                     "gvcolor.exe"                    "GVedit.exe"                     "gvpack.exe"                     "gvpr.exe"
[22] "GVUI.exe"                       "gxl2dot.exe"                    "gxl2gv.exe"                     "iconv.dll"                      "intl.dll"                       "jpeg62.dll"                     "lefty.exe"
[29] "libcairo-2.dll"                 "libcdt-4.dll"                   "libcgraph-4.dll"                "libexpat.dll"                   "libfontconfig-1.dll"            "libfreetype-6.dll"              "libgdk_pixbuf-2.0-0.dll"
[36] "libglib-2.0-0.dll"              "libgmodule-2.0-0.dll"           "libgobject-2.0-0.dll"           "libgraph-4.dll"                 "libgvc-4.dll"                   "libgvplugin_core-5.dll"         "libgvplugin_dot_layout-5.dll"
[43] "libgvplugin_gd-5.dll"           "libgvplugin_neato_layout-5.dll" "libgvplugin_pango-5.dll"        "libltdl-3.dll"                  "libpango-1.0-0.dll"             "libpangocairo-1.0-0.dll"        "libpangoft2-1.0-0.dll"
[50] "libpangowin32-1.0-0.dll"        "libpathplan-4.dll"              "libpng12.dll"                   "libxml2.dll"                    "lneato.exe"                     "mm2gv.exe"                      "neato.exe"
[57] "nop.exe"                        "props.txt"                      "prune.exe"                      "sccmap.exe"                     "settings.ini"                   "tred.exe"                       "twopi.exe"
[64] "unflatten.exe"                  "zlib1.dll"

And the Rgraphviz.dll is present in the correct directory:

> list.files("C:/Users/ckingsley.TGEN/Documents/R/win-library/2.13/Rgraphviz/libs/x64/")
[1] "Rgraphviz.dll"

I'm running 64 bit R 2.13.0 on Windows 7 Professional x64.

Thanks in advance.

__________________________________________

Christopher Kingsley, PhD
Research Assistant Professor
Diabetes, Cardiovascular & Metabolic Disease Division
TGen, The Translational Genomics Research Institute


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