After upgrading to Windows XP and R 1.9.1 and 2.0, I retried to execute plot.baysian() to a data set that I had used previously to plot with no problem in win2000 R1.8. The error I get is: Error in points(Mbar[-index], lods[-index], pch = ".") : only 0's may mix with negative subscripts Thanx in advance Dino Konstantinos G. Liolios IT Software Engineer II Charles E. and Emma H. Morrison Depts. Pathology and Microbiology-Immunology Northwestern University Ward 3-240 303 E. Chicago Avenue Chicago IL 60611 Tel: 312-503-0224 Fax:312-503-0281 http://www.haldarlab.northwestern.edu ===========End of original message text========== Konstantinos G. Liolios IT Software Engineer II Charles E. and Emma H. Morrison Depts. Pathology and Microbiology-Immunology Northwestern University Ward 3-240 303 E. Chicago Avenue Chicago IL 60611 Tel: 312-503-0224 Fax:312-503-0281 http://www.haldarlab.northwestern.edu