readr: count_fields – R documentation

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readr

count_fields

Count the number of fields in each line of a file

Description

This is useful for diagnosing problems with functions that fail to parse correctly.

Usage

count_fields(file, tokenizer, skip = 0, n_max = -1L)

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.
`tokenizer`	A tokenizer that specifies how to break the `file` up into fields, e.g., `tokenizer_csv()`, `tokenizer_fwf()`
`skip`	Number of lines to skip before reading data.
`n_max`	Optionally, maximum number of rows to count fields for.

Examples

count_fields(readr_example("mtcars.csv"), tokenizer_csv())

readr

Read Rectangular Text Data

v1.4.0

GPL (>= 2) | file LICENSE

Authors

Hadley Wickham [aut], Jim Hester [aut, cre], Romain Francois [ctb], R Core Team [ctb] (Date time code adapted from R), RStudio [cph, fnd], Jukka Jylänki [ctb, cph] (grisu3 implementation), Mikkel Jørgensen [ctb, cph] (grisu3 implementation)

Initial release

count_fields

Description

Usage

Arguments

Examples

readr

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