Hi zhang jie, It's best to repost to the bioconductor list instead of contacting a poster directly. The post you reference is very old, and was only specific to that version of R/BioC. Properly and easily installing Rgraphviz has been an on-going problem, and many attempts have been made to simplify the process, although there still may be some problems. The latest post with installation instructions I could find was: http://article.gmane.org/gmane.science.biology.informatics.conductor/2 3932/match=rgraphviz+install If you wait just a couple weeks, both R and BioC will have updated versions which you should use. I'm sure there will then be another round of "how do I install Rgraphviz?!?" on the mailing list then. Good luck, Jenny At 10:45 PM 10/20/2009, you wrote: >Dear Jenny, > >These days I download the Rgraphviz package from >the bioconductor web, but I cannot install it >successfully. I seared the solved method on >line, then I found one letter you have >wrote(<https: stat.ethz.ch="" pipermail="" bioconductor="" 2008-june="" 022838.h="" tml="">https://stat.ethz.ch/pipermail/bioconductor/2008-June/022838.html) . > >I did the steps as you tought, but I still cannot use the Rgraphviz package. >when I run "library(Rgraphviz)", the system >reply "cannot find the libcdt-4.dll, so the..." >please help me to solve this problem, thanks a lot. > > >Best regards, >zhang jie (a student from China) > > >---------- >ÁÄÌì+ËÑË÷+ÓÊÏä ÏëÒªÇáËɳöÓÎ,ÊÖ»úMSN°ïÄã¸ã¶¨! ><http: mobile.msn.com.cn=""/>Á¢¿ÌÏÂÔØ£¡ Jenny Drnevich, Ph.D. Functional Genomics Bioinformatics Specialist W.M. Keck Center for Comparative and Functional Genomics Roy J. Carver Biotechnology Center University of Illinois, Urbana-Champaign 330 ERML 1201 W. Gregory Dr. Urbana, IL 61801 USA ph: 217-244-7355 fax: 217-265-5066 e-mail: drnevich@illinois.edu [[alternative HTML version deleted]]