Extract Rows from File

Description

This function reads through a delimited file on disk, determines if the entry at the specified column is in a character vector of items, and writes that line to file (or to R) if it is.

Usage

1
extract_rows_from_file(file, out = NULL, column, sep = NULL, keep)

Arguments

file

The input file to extract rows from.

out

The location to output the file. If this is NULL, we redirect output back into the R session.

column

The column to check, indexed from 1.

sep

The delimiter used in file. Must be a single character. If no delimiter is specified, we guess the delimiter from the first row of file.

keep

A character vector containing all items that we want to check and keep within the columnth column of each row.

See Also

split_file

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