R: Count the number of fields in each line of a file

count_fields {readr} | R Documentation

## 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).
`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())

[Package readr version 1.1.1 Index]