That is not a bug. Vectors and lists are treated in the same way. A matrix can be considered a list of lists, so in essence, what you have created is indeed an empty matrix. Shawn A. Prestridge Texas Instruments, Inc. Educational & Productivity Solutions 7800 Banner Drive MS 3946 Dallas, Texas 75251 (972) 917-1698 (972) 917-7103 FAX "Until you find something worth dying for, you're not really living." --Anonymous