Description Usage Arguments Examples
Read in chunks from a large file with row/column filtering to obtain a reasonable-sized data.frame.
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file |
the name of the file, obviously |
nrows |
the chunk size; consider reducing this if there are lots of columns |
sep |
by default we expect a CSV file |
header |
is |
row.names |
I really dislike row names |
cols |
for filtering column by name or number (supporting negative indexing) |
rowfilter |
a function that is assumed to take a chunk as a data frame and return a smaller data frame (with fewer rows), separately from the column filtering. |
as.is |
|
estimate |
do a preliminary estimation of the work to be done, and then have a chance to bail out if it looks like a bad idea |
location |
where do you want it? |
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