Greetings-, We have successfully installed the Bioconductor software in Redhat Linux 7.2. However, the method of readAffy() failed in the recent use of the "affy" package although the method was successfully used before. The screen out is like following: [root@renaltools bioc]# R R : Copyright 2003, The R Development Core Team Version 1.7.1 (2003-06-16) R is free software and comes with ABSOLUTELY NO WARRANTY. You are welcome to redistribute it under certain conditions. Type `license()' or `licence()' for distribution details. R is a collaborative project with many contributors. Type `contributors()' for more information. Type `demo()' for some demos, `help()' for on-line help, or `help.start()' for a HTML browser interface to help. Type `q()' to quit R. > library(affy) Welcome to Bioconductor Vignettes contain introductory material. To view, simply type: openVignette() For details on reading vignettes, see the openVignette help page. Creating a new generic function for "summary" in package reposTools Synching your local package management information ... > data <- readAffy() Error: couldn't find function "readAffy" Therefore, we can't use this package to analysis affy data. Please give a hand on this issue.Your help is highly appreciated. Ying [[alternative HTML version deleted]]

> > data <- readAffy() > Error: couldn't find function "readAffy" > Try something like my.data <- ReadAffy() Capitialization is important.

> Version 1.7.1 (2003-06-16) This very well could be the source of your problems. Unless you're using a very old version of Bioconductor (1.2), then you need to upgrade (to 1.8.1 if you're using Bioconductor 1.3 or the 1.9 beta version of R if you're using devel)