Read fixed-format data files using Fortran-style format specifications.
read.fortran(file, format, ..., as.is = TRUE, colClasses = NA)
The format for a field is of one of the following forms:
l is the number of columns,
d is the number of decimal places, and
r is the number of repeats.
D are numeric formats,
A is character,
I is integer, and
X indicates columns to be skipped. The repeat code
r and decimal place code
d are always optional. The length code
l is required except for
X formats when
r is present. For a single-line record,
format should be a character vector. For a multiline record it should be a list with a character vector for each line. Skipped (
X) columns are not passed to
col.names, and similar arguments passed to
read.fwf should not reference these columns.
A data frame
read.fortran does not use actual Fortran input routines, so the formats are at best rough approximations to the Fortran ones. In particular, specifying
d > 0 in the
D format will shift the decimal
d places to the left, even if it is explicitly specified in the input file.
ff <- tempfile() cat(file = ff, "123456", "987654", sep = "\n") read.fortran(ff, c("F2.1","F2.0","I2")) read.fortran(ff, c("2F1.0","2X","2A1")) unlink(ff) cat(file = ff, "123456AB", "987654CD", sep = "\n") read.fortran(ff, list(c("2F3.1","A2"), c("3I2","2X"))) unlink(ff) # Note that the first number is read differently than Fortran would # read it: cat(file = ff, "12.3456", "1234567", sep = "\n") read.fortran(ff, "F7.4") unlink(ff)
Documentation reproduced from R 2.15.3. License: GPL-2.