Thanks, guys! I am using Rscript at the moment and will definitely try littler.
Li Sun 2012/1/4 Rainer M Krug <r.m.k...@gmail.com>: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 04/01/12 10:39, Uwe Ligges wrote: >> >> >> On 03.01.2012 21:22, Li SUN wrote: >>> Thanks, Rolf, Justin and Uwe! >>> >>> Actually I wanted to run .R file as a script, just like what >>> people do for bash scripts or python scripts. It seems to me that >>> adding "#!/usr/bin/R -f" at the first line is what I need. Is >>> this true? >> >> >> Perhaps even "Rscript" rather than "R". > > And there is also littler from Dirk Eddelbüttel: > > http://dirk.eddelbuettel.com/code/littler.html > > - From the description: "littler provides hash-bang (i.e. script > starting with #!/some/path) capability for GNU R, as well as simple > command-line and piping use." > > Similar to Rscript, but with some differences. > > I used both, and in most cases they are equivalent. > > > Rainer > > >> >> Uwe Ligges >> >>> Li Sun >>> >>> >>> 2012/1/2 Rolf Turner<rolf.tur...@xtra.co.nz>: >>>> On 03/01/12 17:02, Li SUN wrote: >>>>> >>>>> Hello, >>>>> >>>>> I am a beginner to the R language and find it fantastic and >>>>> well-designed, quite different from other programming >>>>> languages. >>>> >>>> What a refreshingly sensible attitude!!! :-) >>>> >>>>> This is the first time I post on the r-help mailing list. >>>>> >>>>> In invoking the function source(filename), it seems that the >>>>> filename has to exist in the current working directory, >>>>> otherwise it has to be specified in full path. So is there >>>>> any mechanism(such as environment variable) to specify an >>>>> additional directory of .R files that source() could search >>>>> in? >>>> >>>> >>>> I'm no expert on this, and others may correct me, but >>>> >>>> (1) I don't believe any such mechanism exists. >>>> >>>> (2) It's probably not a good idea, even if such a mechanism >>>> were to exist. Directories have a tree structure, rather than >>>> being linearly ordered in the way that data bases on your R >>>> search path are ordered. >>>> >>>> I believe you would run all sorts of risks of confusion and of >>>> getting the wrong file were you to invoke such a mechanism. >>>> >>>> It is ``good practice'' to have separate directories >>>> associated with different projects and to situate all files, >>>> that you might wish to source in respect of a given project, in >>>> the directory associated with that project. >>>> >>>> I know that this is an irritating sort of response --- ``No, >>>> you can't do that, and you shouldn't do it anyway!'' --- but I >>>> sincerely believe this to be true. >>>> >>>> That being said, I also believe that you could program up such >>>> a mechanism yourself. I.e. build a function "source2()" which >>>> would have a "hard coded" list of directories to search, and >>>> would make use of the "try()" function. >>>> >>>> Might be a good exercise for you, given that you are starting >>>> out in R and looking to upgrade your skills! :-) >>>> >>>> cheers, >>>> >>>> Rolf Turner >>>> >>>> >>> >>> ______________________________________________ >>> 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. >> >> ______________________________________________ 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. > > > - -- > Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation > Biology, UCT), Dipl. Phys. (Germany) > > Centre of Excellence for Invasion Biology > Stellenbosch University > South Africa > > Tel : +33 - (0)9 53 10 27 44 > Cell: +33 - (0)6 85 62 59 98 > Fax : +33 - (0)9 58 10 27 44 > > Fax (D): +49 - (0)3 21 21 25 22 44 > > email: rai...@krugs.de > > Skype: RMkrug > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.11 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iEYEARECAAYFAk8EIs4ACgkQoYgNqgF2egpF+QCeObN8q+U6HHlM/Tsls/wF+VoH > /twAn2zaTzVrCdTxvENSK2buPlFsjlnC > =tEkV > -----END PGP SIGNATURE----- ______________________________________________ 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.