a tool for multiple criteria model analysis (click here to find a summary of relevant research).
MCMA contains ISAAP (modular tool for Interactive Specification and Analysis of Aspiration-Based Preferences). A prepublication draft with a documentation of ISAAP (which contains also a tutorial guide to MCMA) is available as a Postscript file (over 17MB, hence it may take a while to load it to your viewer) and as a zipped Postscript file (that you may want to ftp and unzip on your machine).
MCMA can be used for analysis of any LP (including MIP) model that can be provided in the LP_DIT format (models available in the MPS format can be easily converted by the LPDIT program to the LP_DIT format).
Tutorial models models for MCMA and the on-line tutorial (for browsers that support frames and those without frame support) are also available.
In order to use MCMA you will need the following software:
- HOPDM,
- MOMIP, only if your model contains integer variables,
- LPDIT, only if you would like to use MCMA for analysis of your own model,
- tutorial core models, only, if you want to run the tutorial examples for MCMA.
Janusz Granat
Marek Makowski Customized version of the Interior Point LP solver HOPDM developed by Jacek Gondzio. The version of HOPDM available from IIASA is composed of C++ part that handles data and memory management and of the Fortran part of the original solver.
Documentation: This WP describes an old version of HOPDM. A Working Paper that will document the current version is still under preparation. From the user point of view the old documentation is still helpfull. The main difference between the old and versions is a prototype implementation of the Warm Start (that speeds up solution of sequence of problems having the same dimensions) and a number of enhancements implemented in the solver.
Authors:
Jacek Gondzio
Marek Makowski
a branch-and-bound solver for middle size mixed integer linear programming problems. MOMIP is, essentially, an experimental solver. It turned out to be very reliable and efficient on medium scale models we analyzed (up to 2000 continuous variables/constraints and a few hundred integer variables). Therefore, we have made it available for a wider use. However, Momip does not aspire to compete with commercial solvers in capability to to solve large scale or complex integer problems. MOMIP can solve problems defined in either MPS or LP-DIT format.
Documentation: MOMIP was originally designed as a part of a wider linear programming modular library but only the customized solver is available from IIASA. This WP describes both the MOMIP module and the customized solver.
Authors:
Wlodzimierz Ogryczak
Krystian Zorychta
utility for conversion of LP models available in the MPS format to the LP_DIT format and for handling solutions and model definitions in the LP_DIT format. LP_DIT format is used by all the the software listed above.
The documentation of the current LP_DIT is still under preparation. However, you can easily find out how to use the LPDIT by executing:
lpdit -h
The documentation of the old version of LP_DIT can provide you with its background which is the same for the current version.
Author:
Marek Makowski
- an instance of the Land-use planning core model. Click
here for the model
description.
A prepublication draft with a documentation of AEZWIN
(interface to the AEZ model generator) is available as a
Postscript file
(over 2MB, hence it may take a while to load it to your viewer)
and as a
zipped Postscript file
(that you may want to ftp and unzip on your machine).
The same instance of the Land-Use model is also used in the tutorial
of ISAAP.
- an instance of the Water Quality Management core model (click here for the description).