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NROWS
This value is used to set up a mapped area of memory to contain all
the data from the input file. If you know the number of lines i.e.
the number of values in EACH column then enter this value. Otherwise
enter a number which is too high. e.g. if you know there are
about 10000 lines in the file then enter 20000. The only drawback of this
is that the execution time is a weak function of the size of the mapped
area of memory due to page faulting. So in other words if there are
say 100 lines in the file don't set NROWS to 100000. If you set NROWS to
less than the number of lines in the file then the program will
give you a warning message. It will however produce an output file
with arrays of length NROWS, so you can use this parameter to say
select the first 1000 lines from a file.
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