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Sample Scripts

This page contains sample scripts for the IPAT-S scripting language. IPAT-S is a scripting language for developing scenarios of sustainable futures. It can be downloaded for free. It is open source software, and can be used at no charge in personal and commercial applications.

The scripts on this page illustrate many (but not all) of the features of IPAT-S. For more information about the language, please see the documentation. For more information about sustainability and scenarios, please see the resources page.

• IPAT & ImPACT
• Escaping the IPAT Form
• The IPAT-S Standard Library
• Linear Programming
• Formatted Output

IPAT & ImPACT

• Basic IPAT Demo
  A simple but complete script demonstrating the basic IPAT-S syntax: carbon dioxide emissions as an “IPAT” calculation.
• Expanding the basic script
  An extension of the basic script that calculates cumulative emissions using the IPAT-S accumulate() function.
• ImPACT example
  A script demonstrating the ImPACT formalism.
• Disaggregated ImPACT example
  A slightly more complex ImPACT script, including sector disaggregation.
• Environmental Kuznets Curve
  An “IPAT” example, featuring a complex income-dependent technology factor.

Escaping the IPAT Form

• Lognormal income distribution
  A calculation that does not use the “IPAT” form. Features a lognormal income distribution, implemented with the built-in normal distribution function.
• Trade balance for a small open economy
  Another calculation that does not use the IPAT form. Uses a “textbook” version of the current account and balance of payments to look at trade-offs between investment, domestic savings, exports and growth. Illustrates use of the IPAT-S rate function and interpolate procedure. (Note: you must use IPAT-S ver. 3.6 or later for this script to run properly.)

The IPAT-S Standard Library

• Using an external library
  A simple script that calls an external procedure from a dynamic link library (DLL).
• Performing a “loglet” decomposition
  Another example of an external procedure. A “loglet” decomposition represents a time series as a sum of logistic curves. For more information on loglets see the Loglet Lab site.
• Generating random numbers
  Yet another example of an external procedure. The IPAT-S standard library has routines to generate pseudo-random numbers. In this script, different scenarios show a different, random, variation around a central trend. This script also demonstrates the foreach loop.

Linear Programming

• Linear programming (LP) example
  A script that implements an “energy ladder” by optimizing “convenience” in a linear programming model.
• Land-use change
  Land-use change implemented via an area transition matrix (ATM). A reference ATM is used as a goal in a linear goal program (LGP).
• Input-Output model
  An input-output (IO) model implemented using the IPAT-S linear programming (LP) syntax. This example is explained in detail in the IPAT-S Language Reference. Please see the documentation page.
• Transport scenarios using an LP
  As a final example of using a linear programming (LP) model, this script calculates changes in transport mode choices by exploiting the (controversial) “constant travel time” concept.

Formatted Output

• Producing HTML using a print: block
  A script illustrating use of the IPAT-S print: block to generate HTML output. For more information on generating HTML from an IPAT-S script, see the Language Reference, which can be accessed from the documentation page. Also, there is a built-in HTML previewer in the graphical user interface.
• Producing IISD Dashboard-formatted output using a print: block
  A script illustrating use of the IPAT-S print: block to generate output for the IISD Dashboard of Sustainability. The IISD Dashboard can be launched from the IPAT-S graphical user interface.