New AMPL
Language Features

• Changing the Model and Data
  • Reading data: the data, update data and reset data commands
  • Reading data: the read command
  • Removing or redefining model components
  • Fixing or unfixing a variable at a new value
  • Relaxing integrality

• Character Strings
  • String functions and operators
  • String expressions in AMPL commands
  • Number-to-string conversions
  • String-to-number conversions
  • Character-code conversions
  • Display formats for strings

• Complementarity Problems
  Index to examples
  • Motivation
  • Complementary pairs of inequalities
  • Complementary double inequalities
  • Using the PATH solver
  • Presolve
  • Auxiliary solution values
  • Generic synonyms

• Database Access
  Index to examples
  • General principles of data correspondence
  • Examples of AMPL table-handling statements
  • General forms of the table declaration
  • Reading data from relational tables
  • Writing data to relational tables
  • Reading and writing the same table
  • Indexed collections of tables and columns
  • Standard and built-in table handlers

• Examining Models and Data
  • The show command: displaying model components
  • The xref command: displaying model dependencies
  • The expand command: displaying model instances
  • Generic synonyms for variables, constraints and objectives
  • Summary model information

• Looping and Testing 1:
  Writing "scripts" in the AMPL command language
  Index to examples
  • Running scripts
  • Iterating over a set
  • Iterating subject to a condition
  • Testing a condition
  • Terminating a loop
  • Stepping through a script

• Looping and Testing 2:
  Implementing algorithms through AMPL scripts
  Index to examples
  • Alternating between named problems
  • Defining named problems
  • Using named problems
  • Displaying named problems
  • Defining and using named environments

• Presolve Tolerances
  • Determining that no feasible solution exists
  • Rounding bounds on integer variables

• Reporting and Display
  • Solver return messages
  • Time and memory listings
  • Output logs
  • Limits on messages
  • Prompts

• Statuses
  • Solve results
  • Solver statuses of objectives and problems
  • Solver statuses of variables
  • Solver statuses of constraints
  • AMPL statuses

• Suffixes
  • User-defined suffixes
  • Solver-defined suffixes
  • The suffix statement

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