Bruce A. McCarl.

Transcription

1 Bruce A. McCarl Specialist in Applied Optimization Distinguished Professor of Agricultural Economics, Texas A&M University Principal, McCarl and Associates B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 1

2 Objectives and Method A. Learning objectives 1. GAMS and GAMS use a. Will start elementary but go fast b. Backup provided by examples and documents 2. Firm Impact Analysis risk neutral and risk averse 3. Investment Analysis B. Time is short -- Back up Course Materials 1. Reference materials on pdf backing up course 2. Notebook of Overheads 3. CDROM a. All class examples b. Reference Materials c. Real Models C. Mix of listening and doing hopefully about 60/40 B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 2

3 Class materials a guide to their structure This class is supported by a number of reference documents and class examples. The fundamental support documents are the overheads that are distributed in the notebook. The overall course outline also indicates the name of the overhead set that will be under use during each course segment. The overheads refer to a number of other course support documents and class examples. These include class examples, reference text materials, and class applications. Class examples Generally, the class examples appear under the subdirectory example and are then contained in the subdirectory that is consistent with the name of the overhead series we are working from. Thus, when working with the introductory material the overheads are called gamintro and the class example files are in the example/gamintro subdirectory. Generally I try to place filenames in green within the overheads. B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 3

4 Class materials a guide to their structure Reference text materials. Generally the reference text materials appear under the subdirectory document. In the class overheads references to these materials are colored in purple. Class applications. During the class there will be references made several real applications. The files implementing these applications are generally kept in subdirectory name associated with the application. Again the filenames will be appearing in the overheads in green B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 4

5 Class materials a guide to their structure A list of part of the Reference Documents and their Function Reference Item Name Class Intro Basic GAMS Firm Analysis Modeling Multiple Locations GAMS for Applied Modeling Improved Output / Spreadsheets CGE Modeling Firm Risk Modeling Indivisible Investment modeling Outline Newbook.pdf cgecoursenotes.htm, cgeingams.pdf erwinhomepage.htm Fixmodel.pdf Rutherford.htm McCarl User Guide (through IDE) tips Usegck Probab Other documents can be gotten from GAMS web site and B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 5

6 Additional Reference Documents and their Function Reference Name a Brief Title GAMS Features Improved GAMS usage Model Debugging GAMSCHK Usage Large Scale Modeling fixmodel.pdf gnupltxy.pdf So Your GAMS Model is not Working Right by McCarl GNUPLTY Users guide by Schneider Newbook.pdf Applied Math Programming by McCarl and Spreen Rutherford.htm Web page acessing utilities by Rutherford Sensitivity Analysis.htm GAMS document on sensitivity analysis tips.pdf Tips on GAMS usage by McCarl usegck.pdf An article on using GAMSCHK erwinhomepage.htm createlib.pdf, uselib.pdf gamsmodeling.pdf, lp.pdf, mip.pdf The Excel Interface Doc.htm cgecoursenotes.htm Erwin Kalvahagen s web site with a number of utilities Material on building and using library in IDE Erwin Kalvahagen s book chapters on applied GAMS modeling LIMPORT, LEPORT, LDUMP documentation CGE class notes B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 6

7 Class materials a guide to their structure CDROM Contents Document subdirectory Example subdirectory Yourwork subdirectory Adobe subdirectory Fixmodelsubdirectory zipfile subdirectory basadvgams.exe gamsadds.exe Root directory All resource materials All examples plus some other models. Generally accessed through IDE library Blank to start. Present to catch your work Copy of Adobe PDF reader Examples from fixmodel book that is in document directory Installation files as follows contains all class files. Run this to install files without default write protection (which happens if you copy in the cd) contains all additions to GAMS system mainly documents for docs directory and inclib files like gnupltxy. contains setup.bat that installs self extracting archives, along with installation instructions and class license file B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 7

8 Day 1 Basic to Advanced GAMS Class Introduction Course Schedule 8:00-8:15 Introduction A. Participant Introduction B. Class Introduction 8:15-9:00 GAMS and the IDE gamintro 9:00-9:45 Break and Hands on 1 9:45-10:30 More basic GAMS gamint2 Model Inspect/Document inspect 10:30-11:00 Hands on 2 11:00-11:45 Power of GAMS power 11:45-1:15 Lunch 1:15-1:45 Quick Conditionals qcondrep and Report Writing 1:45-2:30 Hands on 3 2:30-3:30 Firm Modeling firmimp 3:30-4:15 Hands on 4 4:15-5:00 Good Modeling Practice goodmodl 5:00 Recess for day B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 8

9 Day 2 Basic to Advanced GAMS Class Introduction Course Schedule 8:00-8:45 Finish Firm Impact firmimp 8:45-9:15 Hands on 5 9:15-10:30 Fixing Misbehaving Models fixmod 10:30-11:15 Hands on 6 11:15-12:00 Multiple Locations - transportation multiloc 12:00-1:30 Lunch 1:30-2:30 Firm Risk Modeling firmrisk 2:30-3:00 Solving NLPs nlp 3:00-3:45 Hands on 7 and break 3:45-4:15 Integer Programming Indivis 4:15-4:45 More integer programming Integer 4:45-5:30 CGE Modeling cge 5:30 Recess for Day B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 9

10 Day 3 Basic to Advanced GAMS Class Introduction Course Schedule 8:00-8:15 Advanced Class Introduction 8:15-9:00 Using GAMSIDE useide 9:00-9:15 The Users Guide 9:15-9:20 Hands on Introduction handson 9:20-10:00 Break and Hands on 8 or 12 or 13 10:00-10:45 Controlling Algebra - Conditionals condition and Sets 10:45-11:30 Hands on 9 11:30-12:15 Doing a Comparative Analysis compare 12:15-1:30 Lunch 1:30-2:15 Output Improvement and Management output 2:30-3:15 Links with Other Programs part I link 2:30-3:15 Hands on 10 3:14-4:00 Links with Other Programs part II link 4:00-4:45 Hands on 11 or 12 or 13 4:45-5:00 Basic Wrapup 5:00 Recess for the day B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 10

11 Course Schedule Day 4 8:00-8:30 Small to Large Model Development smllrg 8:30-9:15 Looking at Your GAMS model lookmodl 9:15-10:00 Break and Hands on 14 10:00-10:45 Calculations calculat 10:45-11:30 Hands on 15 11:30-12:00 Conditional Compilation condcomp 12:00-1:30 Lunch 1:30-2:30 Post Solution Debugging of unreal Nonsensical Models 2:30-3:15 Hands on 16 or 12 or 13 and break 3:15-4:15 Scaling in GAMS scale 4:15-5:00 Hands on 17 5:00 Recess for day B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 11

12 Day 5 Basic to Advanced GAMS Class Introduction Course Schedule 8:00-8:30 Fixing Execution Errors execerr 8:30-9:15 Fixing Unbounded and Infeasible unbinf Models 9:15-10:00 Hands on 18 10:00-10:30 Customizing GAMS custom 10:30-11:00 Saves and Restarts savrestar 11:00-11:30 Solution, Solvers and Reformulations solver 11:30-1:00 Lunch 1:00-1:45 Speeding up GAMS Execution Time speedup 1:45-2:15 Memory management memory 2:15-3:00 Break and Hands on 19 3:00-3:45 Advanced Bases advbasis 3:45-4:30 Break and Hands on 20 5:00-5:15 Wrap It Up wrapup 5:15 Workshop adjourns B.A. McCarl, June 2011 Basic to Advanced GAMS Class Introduction page 12