I am using awk to pre-process several data files that have date-time information in a non-standard format. The files can be in the many tens of thousands of lines. At present, I plan to use scan(pipe()) or perhaps read.table(pipe()) with whatever other arguments are necessary. It occurs to me that using awk I have the opportunity to read the datetime information as either a single character vector of datetimes and use as.POSIXct() , or as six numeric vectors and use ISOdate(). I would appreciate advice about the relative merits. I would tend to prefer the faster one, if there is much difference. Thanks -Don p.s. I haven't quite sorted out the options, i.e., when to use strftime(), when to use format.POSIXct(), when to use as.POSIXct(). At the moment, though, I believe I would use as.POSIXct(). I don't at this point see any reason to use the "lt" structure in my current application.
version
_ platform powerpc-apple-darwin1.3.7 arch powerpc os darwin1.3.7 system powerpc, darwin1.3.7 status major 1 minor 3.0 year 2001 month 06 day 22 language R (and I will probably also use a Solaris version at some point)
-------------------------------------- Don MacQueen Environmental Protection Department Lawrence Livermore National Laboratory Livermore, CA, USA -------------------------------------- -.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.-.- 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 _._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._._