Look at the man page for dd (assuming you are on *nix) A quick google will get you a command to try. I'm not at my desk or I would as well.
Jeff Jeffrey Ryan | Founder | jeffrey.r...@lemnica.com www.lemnica.com On May 2, 2012, at 5:23 PM, Jonathan Greenberg <j...@illinois.edu> wrote: > R-helpers: > > What would be the absolute fastest way to make a large "empty" file (e.g. > filled with all zeroes) on disk, given a byte size and a given number > number of empty values. I know I can use writeBin, but the "object" in > this case may be far too large to store in main memory. I'm asking because > I'm going to use this file in conjunction with mmap to do parallel writes > to this file. Say, I want to create a blank file of 10,000 floating point > numbers. > > Thanks! > > --j > > -- > Jonathan A. Greenberg, PhD > Assistant Professor > Department of Geography and Geographic Information Science > University of Illinois at Urbana-Champaign > 607 South Mathews Avenue, MC 150 > Urbana, IL 61801 > Phone: 415-763-5476 > AIM: jgrn307, MSN: jgrn...@hotmail.com, Gchat: jgrn307, Skype: jgrn3007 > http://www.geog.illinois.edu/people/JonathanGreenberg.html > > [[alternative HTML version deleted]] > > _______________________________________________ > R-sig-hpc mailing list > r-sig-...@r-project.org > https://stat.ethz.ch/mailman/listinfo/r-sig-hpc ______________________________________________ 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.
