the name of the file which the data are to be read
from.
header
a logical value indicating whether the file contains
the names of the columns as its first line.
sep
the field separator character. Values on each line of
the file are separated by this character.
skip
the number of lines of the data file to skip before
beginning to read data.
Details
Usually each row of the file represents an
observation and each column contains a variable. The first row
possibly contains the names of the variables (columns).
read.matrix might be more efficient than
read.table for very large data sets.