read_lines: Read lines from the file
In LaF: Fast Access to Large ASCII Files

Reads the specified lines and columns from the data file.

read_lines(x, ...)

## S4 method for signature 'laf'
read_lines(x, rows, columns = 1:ncol(x), ...)

## S4 method for signature 'laf_column'
read_lines(x, rows, columns = 1:ncol(x), ...)

`x`	an object the supports the `read_lines` method, such as an `laf` object.
`...`	passed on to other methods.
`rows`	a numeric vector with the rows that should be read from the file.
`columns`	an integer vector with the columns that should be read in.

Note that when scanning through the complete file next_block is much faster. Also note that random file access can be slow (and is always much slower than sequential file access), especially for certain file types such as comma separated. Reading is generally faster when the lines that should be read are sorted.

LaF documentation built on March 26, 2020, 6:59 p.m.