This file format is available if you use the ILOG CPLEX barrier optimizer. In a VEC file, spaces differentiate entries on a line. Blank spaces are not allowed within names or values. Blank lines are not permitted.

ILOG CPLEX reads and writes VEC files in a standard format consisting of a NAME line, VARIABLE lines, CONSTRAINT lines, and an END line.

NAME line, a single line, the first in the file, defines the name of the problem. For example,

NAME          problem-name

VARIABLE lines, a separate one for each variable, consist of four fields, like this:

c  cname  primal-value   reduced-cost

CONSTRAINT lines, a separate one for each constraint, also consist of four fields, like this:

r  rname  slack-value    dual-value

END line, consisting of the token ENDATA, completes a VEC file.