read_table

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Read whitespace-separated columns into a tibble

read_table() and read_table2() are designed to read the type of textual data where each column is separated by one (or more) columns of space.

read_table2() is like read.table(), it allows any number of whitespace characters between columns, and the lines can be of different lengths.

read_table() is more strict, each line must be the same length, and each field is in the same position in every line. It first finds empty columns and then parses like a fixed width file.

spec_table() and spec_table2() return the column specifications rather than a data frame.

Usage
read_table(file, col_names = TRUE, col_types = NULL,
  locale = default_locale(), na = "NA", skip = 0, n_max = Inf,
  guess_max = min(n_max, 1000), progress = show_progress(),
  comment = "", skip_empty_rows = TRUE)

read_table2(file, col_names = TRUE, col_types = NULL, locale = default_locale(), na = "NA", skip = 0, n_max = Inf, guess_max = min(n_max, 1000), progress = show_progress(), comment = "", skip_empty_rows = TRUE)

Arguments
file

Either a path to a file, a connection, or literal data (either a single string or a raw vector).

Files ending in .gz, .bz2, .xz, or .zip will be automatically uncompressed. Files starting with http://, https://, ftp://, or ftps:// will be automatically downloaded. Remote gz files can also be automatically downloaded and decompressed.

Literal data is most useful for examples and tests. It must contain at least one new line to be recognised as data (instead of a path) or be a vector of greater than length 1.

Using a value of clipboard() will read from the system clipboard.

col_names

Either TRUE, FALSE or a character vector of column names.

If TRUE, the first row of the input will be used as the column names, and will not be included in the data frame. If FALSE, column names will be generated automatically: X1, X2, X3 etc.

If col_names is a character vector, the values will be used as the names of the columns, and the first row of the input will be read into the first row of the output data frame.

Missing (NA) column names will generate a warning, and be filled in with dummy names X1, X2 etc. Duplicate column names will generate a warning and be made unique with a numeric prefix.

col_types

One of NULL, a cols() specification, or a string. See vignette("readr") for more details.

If NULL, all column types will be imputed from the first 1000 rows on the input. This is convenient (and fast), but not robust. If the imputation fails, you'll need to supply the correct types yourself.

If a column specification created by cols(), it must contain one column specification for each column. If you only want to read a subset of the columns, use cols_only().

Alternatively, you can use a compact string representation where each character represents one column: c = character, i = integer, n = number, d = double, l = logical, f = factor, D = date, T = date time, t = time, ? = guess, or _/- to skip the column.

locale

The locale controls defaults that vary from place to place. The default locale is US-centric (like R), but you can use locale() to create your own locale that controls things like the default time zone, encoding, decimal mark, big mark, and day/month names.

na

Character vector of strings to interpret as missing values. Set this option to character() to indicate no missing values.

skip

Number of lines to skip before reading data.

n_max

Maximum number of records to read.

guess_max

Maximum number of records to use for guessing column types.

progress

Display a progress bar? By default it will only display in an interactive session and not while knitting a document. The display is updated every 50,000 values and will only display if estimated reading time is 5 seconds or more. The automatic progress bar can be disabled by setting option readr.show_progress to FALSE.

comment

A string used to identify comments. Any text after the comment characters will be silently ignored.

skip_empty_rows

Should blank rows be ignored altogether? i.e. If this option is TRUE then blank rows will not be represented at all. If it is FALSE then they will be represented by NA values in all the columns.

See Also

read_fwf() to read fixed width files where each column is not separated by whitespace. read_fwf() is also useful for reading tabular data with non-standard formatting.

Aliases
  • read_table
  • read_table2
Examples
# NOT RUN {
# One corner from http://www.masseyratings.com/cf/compare.htm
massey <- readr_example("massey-rating.txt")
cat(read_file(massey))
read_table(massey)

# Sample of 1978 fuel economy data from
# http://www.fueleconomy.gov/feg/epadata/78data.zip
epa <- readr_example("epa78.txt")
cat(read_file(epa))
read_table(epa, col_names = FALSE)
# }
Documentation reproduced from package readr, version 1.3.1, License: GPL (>= 2) | file LICENSE

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