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...data.frame(). R used to offer the optional argument, as.is=TRUE (and S-PLUS offered stringsAsFactors=FALSE), to accomplish what this task but it seems that this argument was removed some time ago. Is there a more attractive alternative available now? Thanks very much, Satoshi __________ Satoshi Takahama Scripps Institution of Oceanography Center for Atmospheric Science 9500 Gilman Drive, Dept. 0221 La Jolla, CA 92093 858-531-5328

...n the functions and structure of the data that would correspond to those in S-PLUS. If I am incorrect in my assessment of the 'its' library, I would appreciate any advice on effective ways in which calendar-based time-series can be treated in R. Thank you very much, Satoshi ___ Satoshi Takahama Carnegie Mellon University Dept. of Chemical Engineering Pittsburgh, PA 15213

I can run one-sample t-test on an array, for example a matrix myData1, with the following apply(myData1, 2, t.test) Is there a similar fashion using apply() or something else to run 2-sample t-test with datasets from two groups, myData1 and myData2, without looping? TIA, Gang

...g example (which has worked for my problem): lx1 <- ifelse(abs(lx - nx) < 1e-10, nx - 1, trunc(lx)) ly1 <- ifelse(abs(ly - ny) < 1e-10, ny - 1, trunc(ly)) I hope this is an appropriate posting for an error report. Thank you very much for your hard work, Satoshi _____ Satoshi Takahama Dept. of Chemical Engineering Carnegie Mellon University Pittsburgh, PA 15213 Phone: 412-268-7570