Hello Xi, Have you tried replacing the for loop by an apply construct, e.g., lapply or sapply? In my experience these functions are more efficient than for. At any rate, if you succeed with, say, lapply, there are some R packages that support parallel processing versions. I believe the package parallel is now part of base R, and a version of multicore's mclapply (which, in multicore, does not support Windows) is available.
Regards, Richard Richard R. Liu Hebelstr. 136 CH-4056 Basel Switzerland Tel.: +41 61 321 66 00 Mobil: +41 79 708 67 66 Email: richard....@pueo-owl.ch
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