Dear all, The use of the function avdiff to compute expression values from probe intensities was problematic with some arrays (some probe pair sets are too small). The computing of the trimmed average was then failing. The bug was reported, along with a fix for it (Thanks to Steen Knudsen): if the set is too small, the plain average is taken (no trim). This has been included in both the released and development versions of the package. The changes should be reflected on the website tomorrow. Laurent -- -------------------------------------------------------------- Laurent Gautier CBS, Building 208, DTU PhD. Student DK-2800 Lyngby,Denmark tel: +45 45 25 24 89 http://www.cbs.dtu.dk/laurent