Dear Helper: I did program "tapply", then get the results. But I'm in trouble with the next step on which I want to make the plot using the results of "tapply". Say, programming tapply(X, INDICES, Function), get the results with INDICES and values calculating Function of X. Here, I like to plot(INDICES, values calculating Function of X). Could you let me know how to do it? Thank you so much. MIJEOM JOE, Ph.D. Advisory Engineer, IT Infrastructure Team Information Technology R & D Center SAMSUNG SDS CO., LTD. TEL: 82-31-785-4527 FAXL: 82-31-785-4452 CELL: 82-11-9556-6808 E-mail: mijeom.joe at samsung.com KCCH: 82-2-974-2501 (Extension 1458) -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- r-help mailing list -- Read http://www.ci.tuwien.ac.at/~hornik/R/R-FAQ.html Send "info", "help", or "[un]subscribe" (in the "body", not the subject !) To: r-help-request at stat.math.ethz.ch _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._