Description Usage Arguments Value Author(s)
A wrapper around the core iotools functions to easily apply a function over chunks of a large file. Results can be either written to a file or returned as an internal list.
1 2 3 4 |
input |
an input connection or character vector describing a local file. |
output |
an optional output connection or character vector describing a local file.
If |
formatter |
a function that takes raw input and produces the input given to |
FUN |
a user provided function to map over the chunks. The result of FUN is either
wrapper in a list item, when |
key.sep |
optional key separator given to |
max.line |
maximum number of lines given to |
max.size |
maximum size of a block as given to |
output.sep |
single character giving the field separator in the output. |
output.nsep |
single character giving the key separator in the output. |
output.keys |
logical. Whether as.output should interpret row names as keys. |
skip |
integer giving the number of lines to strip off the input before reading. Useful when the input contains a row a column headers |
... |
additional parameters to pass to |
A list of results when output
is NULL
; otherwise no output is returned.
Taylor Arnold
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