GAMS system - Optimization software

Introduction

The General Algebraic Modeling System (GAMS) is specifically designed for modeling linear, nonlinear and mixed integer optimization problems. The system is especially useful with large, complex problems. GAMS is available for use on personal computers, workstations, mainframes and supercomputers.

GAMS allows the user to concentrate on the modeling problem by making the setup simple. The system takes care of the time-consuming details of the specific machine and system software implementation.

GAMS is especially useful for handling large, complex, one-of-a-kind problems which may require many revisions to establish an accurate model. The system models problems in a highly compact and natural way. The user can change the formulation quickly and easily, can change from one solver to another, and can even convert from linear to nonlinear with little trouble.

System Features

GAMS lets the user concentrate on modeling. By eliminating the need to think about purely technical machine-specific problems such as address calculations, storage assignments, subroutine linkage, and input-output and flow control, GAMS increases the time available for conceptualizing and running the model, and analyzing the results. GAMS structures good modeling habits itself by requiring concise and exact specification of entities and relationships. The GAMS language is formally similar to commonly used programming languages. It is therefore familiar to anyone with programming experience.

Using GAMS, data are entered only once in familiar list and table form. Models are described in concise algebraic statements which are easy for both humans and machines to read. Whole sets of closely related constraints are entered in one statement. GAMS automatically generates each constraint equation, and lets the user make exceptions in cases where generality is not desired. Statements in models can be reused without having to change the algebra when other instances of the same or related problems arise. The location and type of errors are pinpointed before a solution is attempted. GAMS handles dynamic models involving time sequences, lags and leads and treatment of temporal endpoints.

GAMS is flexible and powerful. Models are fully portable from one computer platform to another when GAMS is loaded to each platform. GAMS facilitates sensitivity analysis. The user can easily program a model to solve for different values of an element and then generate an output report listing the solution characteristics for each case. Models can be developed and documented simultaneously because GAMS allows the user to include explanatory text as part of the definition of any symbol or equation. GAMS is being enhanced and expanded on a continuing basis. Please inspect the release notes for more details.

You can download the current GAMS system from : http://www.gams.com/download/

MATLAB

Release 2009b includes new features in MATLAB and Simulink, and updates and bug fixes to 83 other products. R2009b adds support for the 64-bit Mac platform. Subscribers to MathWorks Software Maintenance Service can download product updates. R2009b also includes enhancements to the License Center, the online tool for activating software and managing your license and user information.

New capabilities for the MATLAB product family include:
* Redesigned Help browser, access to the MATLAB Central File Exchange directly from MATLAB, and other desktop enhancements
* Expanded multicore support for functions in MATLAB and Image Processing Toolbox, and parallel support for functions in Statistics Toolbox
* New interface in Parallel Computing Toolbox for accessing and manipulating distributed arrays on a cluster
* Support for processing arbitrarily large image files in Image Processing Toolbox
* Support for search and retrieval of geographic data sets from Web Map Service (WMS) servers in Mapping Toolbox
* Global settings to simplify arithmetic with fixed-point variables in Fixed-Point Toolbox

New capabilities for the Simulink product family include:
* Variable size signals and data in Simulink, Signal Processing Blockset, and Embedded MATLAB code for simulation and code generation
* Model variants for managing design alternatives for Simulink and Real-Time Workshop
* Turnkey PID controller blocks in Simulink and automated tuning with Simulink Control Design
* Reduced data copies with Real-Time Workshop and customizable matrix operations for embedded signal processing code generation
* Model Advisor Configuration Editor to manage and deploy configurations and custom checks in Simulink Verification and Validation
* New interactive compilation report for analyzing array sizes and other Embedded MATLAB code characteristics.

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Aspenplus-11.1
File and Folder in the rar archive

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HYSYS 3.2

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