Try:
a <- function(x)m<<-4 On Mon, Jun 15, 2009 at 3:10 PM, Jarrett Byrnes <byr...@msi.ucsb.edu> wrote: > I'm working on a program that loads several large data files. I'm > using ddply (plyr is really awesome) but I want to minimize the amount > of times a large data file is read in. One solution is to keep track > of which data file is open with a global variable and then change the > currently open data file globally as needed. However, I'm unclear on > how to alter a global variable from within a function. For example > > m<-3 > a<-function(x) m<-4 > > a(3) > > m > > shows that m is still 3 at the end of it all. With the code above, > how could I modify the function a to actually set m to whatever value > I wanted globally? > > Thanks for any pointers! > > -Jarrett > > > > > ---------------------------------------- > Jarrett Byrnes > Postdoctoral Associate, Santa Barbara Coastal LTER > Marine Science Institute > University of California Santa Barbara > Santa Barbara, CA 93106-6150 > http://www.lifesci.ucsb.edu/eemb/labs/cardinale/people/byrnes/index.html > > > [[alternative HTML version deleted]] > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[alternative HTML version deleted]]
______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
