description:
Uses the quick-sort algorithm to sorts a data set into ascending (or descending) order by the abscissae, subsorting by the
ordinates, with optional elimination of duplicate points.
files: inputfile contains the data set to be sorted. The result is placed in outputfile.
options:
descending_order
Requests sorting into descending order, rather than the default ascending order.
unique
Requests elimination of duplicate points.
x_tolerance, y_tolerance
These options specify tolerances for the abscissae and ordinate values. Any two values within
the relevant tolerance of one another are considered identical. If both the abscissae and
ordinates of two points are identical in this sense, the points are considered duplicates.
The default value is 0 for both tolerances.
format
Specifies a C-style format string for printing the data to the output file.