Function for counting the number of lines of very large text
files. Note that it only works on unix-based systems as it uses the
wc command line utility
Usage
nrLinesFile(f)
Arguments
f
A file name (a string)
Value
An integer
Details
The function creates a data set corresponding to the embed of a
certain size of a given univariate time series.
For instance for an embed of size 3 each row of the data set will
contain the value of the series at time t, t-1 and t-2.
References
Torgo, L. (2016) Data Mining using R: learning with case studies,
second edition,
Chapman & Hall/CRC (ISBN-13: 978-1482234893).