Read a table of fixed width formatted data into a
read.fwf(file, widths, header = FALSE, sep = "\t", skip = 0, row.names, col.names, n = -1, buffersize = 2000, ...)
- the name of the file which the data are to be read from.
filecan be a connection, which will be opened if necessary, and if so closed at the end of the function call.
- integer vector, giving the widths of the fixed-width fields (of one line), or list of integer vectors giving widths for multiline records.
- a logical value indicating whether the file contains the names of the variables as its first line. If present, the names must be delimited by
- character; the separator used internally; should be a character that does not occur in the file (except in the header).
- number of initial lines to skip; see
- the maximum number of records (lines) to be read, defaulting to no limit.
- Maximum number of lines to read at one time
- further arguments to be passed to
read.table. Useful further arguments include
Multiline records are concatenated to a single line before processing. Fields that are of zero-width or are wholly beyond the end of the line in
file are replaced by
Negative-width fields are used to indicate columns to be skipped, e.g.,
-5 to skip 5 columns. These fields are not seen by
read.table and so should not be included in a
colClasses argument (nor in the header line, if present).
buffersize argument may reduce memory use when reading large files with long lines. Increasing
buffersize may result in faster processing when enough memory is available.
ff <- tempfile() cat(file = ff, "123456", "987654", sep = "\n") read.fwf(ff, widths = c(1,2,3)) #> 1 23 456 \ 9 87 654 read.fwf(ff, widths = c(1,-2,3)) #> 1 456 \ 9 654 unlink(ff) cat(file = ff, "123", "987654", sep = "\n") read.fwf(ff, widths = c(1,0, 2,3)) #> 1 NA 23 NA \ 9 NA 87 654 unlink(ff) cat(file = ff, "123456", "987654", sep = "\n") read.fwf(ff, widths = list(c(1,0, 2,3), c(2,2,2))) #> 1 NA 23 456 98 76 54 unlink(ff)
Documentation reproduced from R 3.0.1. License: GPL-2.