Read the next block of data from a file.
next_block(x, ...)# S4 method for laf
next_block(x, columns = 1:ncol(x), nrows = 5000, ...)
# S4 method for laf_column
next_block(x, nrows = 5000, ...)
an object the supports the next_block method, such as an
laf object.
passed to other methods.
Reads the next block of lines from a file. The method returns a
data.frame. The first line in the data.frame is the line
corresponding to the current line in the file. When the end of the file is
reached a data.frame with zero rows is returned. This can be used to
check whether the end of the file is reached.
an integer vector with the columns that should be read in.
the (maximum) number of rows to read in one block