Description Usage Arguments Details
Reads the specified file block by block and feeds each block to the specified function.
1 2 3 4 5 6 7 8 9 10 11 12 | process_blocks(x, fun, ...)
## S4 method for signature 'laf'
process_blocks(
x,
fun,
columns = 1:ncol(x),
nrows = 5000,
allow_interupt = FALSE,
progress = FALSE,
...
)
|
x |
an object the supports the |
fun |
a function to apply to each block (see details). |
... |
additional parameters are passed on to |
columns |
an integer vector with the columns that should be read in. |
nrows |
the (maximum) number of rows to read in one block |
allow_interupt |
when TRUE the function |
progress |
show a progress bar. Note that this triggers a calculation
of the number of lines in the file which for CSV files can take some time.
When numeric |
The function should accept as the first argument the next block of data. When
the end of the file is reached this is an empty (zero row) data.frame
.
As the second argument the function should accept the output of the previous
call to the function. The first time the function is called the second
argument has the value NULL
.
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