|LINGO 15.0 Enhancements|
Release 15 of LINGO includes support for a new platform as well as a wide range of performance enhancements and new features.
• Native Apple Mac Support
LINGO's user interface has been entirely rewritten to offer native support for the Macintosh.
• Faster Solutions on Linear Models with Improved Simplex Solver
Simplex LP algorithm improvements boost speed and robustness. Primal Simplex Solver averages 90% faster and Dual Simplex Solver averages 45% faster.
• Better Performance on Integer Models
Improved solution times across broad classes of IP models from enhancements due to improved knapsack related cuts, superior default node selection rules, and branching variable selection rule options.
• Expanded Capabilities of Efficient Solution of Quadratic Problems
If you work with covariance matrices, you'll appreciate the ability to impose Positive Definiteness (POSD) as a constraint. If estimating a covariance matrix for a portfolio, a constraint may be added to force the matrix to be positive semi-definite (a property required of any covariance matrix). Also, new reformulation capabilities give improved performance on quadratic portfolio models with semi-continuous variables (e.g. min-buy quantities) and cardinality (upper limit on assets) constraints. The Quadratic repair feature can improve performance on not quite convex QP’s.
• Smarter Presolver
New preprocessing for linear programs significantly reduces coefficient density of certain dense matrices. This can significantly improve performance on models such as production planning with many periods.
• Improved Nonlinear Solver
Upgraded default settings provide performance improvements overall on nonlinear models. Faster processing of long (1000’s of terms) nonlinear expressions in nonlinear models.
• Faster Model Generation
Additional multithreaded code added to model generator to improve generation times on large models.