Nl (format)


nl is a file format for presenting and archiving mathematical programming problems. Initially this format has been invented for connecting solvers to AMPL. It has also been adopted by other systems such as COIN-OR, FortSP, and Coopr.
The nl format supports a wide range of problem types, among them:
The nl format is low-level and is designed for compactness, not for readability. It has both binary and textual representation.
Most commercial and academic solvers accept this format either directly or through special driver programs.
The open-source AMPL Solver Library distributed via Netlib and AMPL/MP library provide nl parsers that are used in many solvers.