parimport (version 0.0.5)

rlchunk: read a flat file specifying first and last records to import

Description

read a flat file specifying first and last records to import

Usage

rlchunk(fspec, start, end, confun = gzfile, txfun=NULL)

Arguments

fspec

character string specifying location and name of flat file

start

first record for import

end

last record for import

confun

connection function such as gzfile or file

txfun

if non-null, function that will be applied to each line of the chunk read

Value

• vector of strings as returned by readLines

Details

opens connection with open="r"

Examples

gfspec = system.file("gz/demo.txt.gz", package="parimport")
fspec = system.file("txt/demo.txt", package="parimport")
rlchunk( gfspec, 3, 7 )
rlchunk( fspec, 2, 4, file )
mytx = function(recs) sapply(recs, 
   function(rec) strsplit(rec, "")[[1]][2], USE.NAMES=FALSE)
rlchunk( gfspec, 3, 7, txfun=mytx )