Hi BioC, I would like to access GEO files in R and Make expression set of below ID: > geo <- GEO() > queryGEO(geo,"GDS813"); <0 x 0 matrix> but GSM107 works fine..what could be the reason? Anyone had this kind of problem or not..or I am doing something wrong? Thank you, Saurin Jani -- |------------------------------------------------ | Saurin Jani,MS | Statistical and Research Analyst | | Department of Cell Biology and Anatomy | Medical University of South Carolina (MUSC) | 173 Ashley Ave | Charleston,SC - 29407 (US) | | Email: jani@musc.edu | Phone: (843)792-5483 |------------------------------------------------