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. To be recognised as a path, it must be wrapped with `I()`, be a string containing at least one new line, or be a vector containing at least one string with a new line. 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())

[Package readr version 2.0.2 Index]