# NL

NL is an actively used application created in 1993. 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 (as one of the input formats), FortSP (for interacting with external solvers), and Coopr (as one of its output formats). Read more on Wikipedia...

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- NL ranks in the top 25% of languages
- the NL wikipedia page
- NL first appeared in 1993
- file extensions for NL include nl
- See also: ampl, netlib
- Have a question about NL not answered here? Email me and let me know how I can help.

### Example code from Linguist:

g3 0 1 0 # problem assign0 9 6 1 0 6 # vars, constraints, objectives, ranges, eqns 0 0 # nonlinear constraints, objectives 0 0 # network constraints: nonlinear, linear 0 0 0 # nonlinear vars in constraints, objectives, both 0 0 0 1 # linear network variables; functions; arith, flags 9 0 0 0 0 # discrete variables: binary, integer, nonlinear (b,c,o) 18 9 # nonzeros in Jacobian, gradients 0 0 # max name lengths: constraints, variables 0 0 0 0 0 # common exprs: b,c,o,c1,o1 C0 n0 C1 n0 C2 n0 C3 n0 C4 n0 C5 n0 O0 0 n0 r 4 1 4 1 4 1 4 1 4 1 4 1 b 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 0 0 1 k8 2 4 6 8 10 12 14 16 J0 3 0 1 1 1 2 1 J1 3 3 1 4 1 5 1 J2 3 6 1 7 1 8 1 J3 3 0 1 3 1 6 1 J4 3 1 1 4 1 7 1 J5 3 2 1 5 1 8 1 G0 9 0 1 1 3 2 3 3 2 4 3 5 3 6 3 7 3 8 2

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Last updated August 9th, 2020