Hello, Thanks for your quickly answer, and for your advice. The info of my system is: R version 2.7.0 (2008-04-22) i386-pc-mingw32 attached base packages: [1] tools stats graphics grDevices utils datasets methods [8] base other attached packages: [1] amap_0.8-2 Biobase_2.0.1 Regards Henrique Proen?a Vincent Carey 525-2265 wrote: >> Hello, >> >> I am trying to apply the function "hcluster" (contained within the >> "amap" package) to data matrix with no variability between its columns. >> The example I am using is: >> >> >> x <- data.frame(col1=c(20,30,45,7,6,5,4,3),col2=c(20,30,45,7,6,5,4,3), >> stringsAsFactors=FALSE) >> hcluster(x, method="correlation", link = "complete") >> >> >> In this case, the error generated is fatal and the application (R >> environment) stops completely (crashes) without any control of the >> error. I do understand it in the way one can not apply the correlation >> to a vector with no variability, but in the following case: > > I can confirm this on R 2.7.0 for macosx; you did not tell us the platform > you are using; please read the posting guide and supply sessionInfo() > for such queries. > > amap is contributed by Antoine Lucas, as noted on the CRAN distribution > point, please notify him. Clearly there is inadequate error management > through his call to .C. (Developers are encouraged to use .Call instead.) > >> x <- data.frame(col1=c(20,30,45,7,6,5,4,3),col2=c(20,30,45,7,6,5,7,7), >> stringsAsFactors=FALSE) >> hcluster(x, method="correlation", link = "complete") >> >> There are rows without variability, and others (last two rows) >> containing some. When I use this example, the R environment does not >> crash. So, my question is: Why the "hcluster" funcions generates this >> fatal error when no variability is found in all the matrix rows ? >> >> >> Thanks in advance >> >> -- >> Regards >> Henrique Proen?a >> >> _______________________________________________ >> Bioconductor mailing list >> Bioconductor at stat.math.ethz.ch >> https://stat.ethz.ch/mailman/listinfo/bioconductor >> Search the archives: http://news.gmane.org/gmane.science.biology.informatics.conductor >> >> >> ------------------------------------------------------------------- ----- >> >> >> The information transmitted in this electronic communication is intended only >> for the person or entity to whom it is addressed and may contain confidential >> and/or privileged material. Any review, retransmission, dissemination or other >> use of or taking of any action in reliance upon this information by persons or >> entities other than the intended recipient is prohibited. If you received this >> information in error, please contact the Compliance HelpLine at 800-856-1983 and >> properly dispose of this information. >> >>