The following features are demonstrated in this example:
problem type: linear programming (data envelopment analysis)
numeric and string index sets
reading and writing multiple data sets
reading dense two-dimensional data
calling a solver in a DO loop
calling a solver in a COFOR loop
.sol variable suffix
storing a solution in a numeric parameter
using a colon (:) to select members of a set
set operator DIFF
writing dense two-dimensional data
writing sparse two-dimensional data