Winter 2008

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GoldSim News

  GoldSim Resources

Partner Spotlight

  Modeler's Corner

What's Cooking


Tips and Tricks


Model Library



Specifying a Custom Distribution:

GoldSim has a large library of stochastic distributions but sometimes data cannot be easily parameterized.   In these cases you can use a Cumulative distribution to define the data.  A Cumulative distribution allows you to specify points on any arbitrary cumulative distribution function.  Data points can be pasted from Excel or manually specified to recreate any distribution within GoldSim. 



The GoldSim Model Library allows GoldSim users to build on the experience and knowledge of others by sharing models. The Library is available from within the GoldSim Resource Center (GRC).

New models that have recently been added include:

Model 71: Hydropower Plant Simulation. This model is based on the Great Falls Project, a series of five hydroelectric dams near Great Falls, Montana.   The model allows the user to experiment with a few operating strategies and evaluate the results in terms of power generation, downstream flows, and pool elevations.

Model 72: Simple Predator-Prey Models. This suite of seven predator-prey simulations models is based on the book "Modeling the Environment" by Andrew Ford. 

Model 73: Simplified Automotive Supply Chain Model. This is a demonstration model of an automobile supply chain. It represents two links in the chain: the OEM and a major tier 1 supplier.

If you have a model that you think would be worth posting to the library, please send it, along with a description, to

Winter 2008 GoldSim Newsletter

GoldSim's mission is to help you make better decisions in an uncertain world by providing state-of-the-art software, training and expert consulting. Our GoldSim simulation software package provides the power, flexibility, and usability to efficiently simulate and understand the future behavior of complex systems in business, engineering, and science.

Since this newsletter is for you, we encourage you to share your comments and contributions with us. Please email your thoughts to

GoldSim News

2008 GoldSim Service Pack 4 Released

GoldSim 9.60 SP4 (Service Pack 4) was released on Feb 1, 2008.  Version 9.60 SP4 includes some minor feature enhancements and a number of bug corrections.   All reported bugs were corrected, except some minor user interface issues.  Specific items that were modified include:

  • The CT Module's Network Pathway element was modified to support up to 999 watch groups for monitoring internal flux rates.

  • The Function-of and Affects browsers that let users follow the chain of logic through a model have been modified to allow tracing logic into and through SubModel elements.

  • Corrected a problem with the Time Series element that could cause it to compute incorrect 'Average value over timestep' when extremely short timesteps occurred.

  • Corrected a problem in SP3 where an invalid input to an Allocator element would cause a crash while editing the model.

  • Corrected a problem in computing sensitivity analysis coefficients for very large matrices (due to roundoff).  Also corrected a problem where sensitivity analysis results were not updated after changing the input selections.

to log into the GRC to view the release notes and download GoldSim 9.60 SP4.

GoldSim Resources

GoldSim Videos

We have started producing videos explaining elements, their attributes and examples of their usage.  These five minute videos provide a quick way to get started with a particular element and learn how it can be used in your models.

to view GoldSim Videos

GoldSim Reliability Webinar

We invite you to an Introduction to the Reliability Module webinar on March 6, 2008 at 8:30 AM PST (-8 hours GMT). Andrew Burns will discuss the basic features of the Reliability elements and show how they can be used to simplify modeling of system states in your GoldSim models. This webinar is a great way to see how you might take advantage of the Reliability Learning Edition (included with GoldSim Pro) in your own models. Click here to send an email to Tim Schmitt to receive an invitation. Depending upon the response, a second time may be added to better accommodate attendees in Asia and Australia. Send us a note and we'll let you know!

Free GoldSim Reliability Elements

Did you know that all GoldSim versions provide access to the Reliability Learning Edition, allowing you to use up to ten Reliability elements? The Reliability Module (RL) allows you to probabilistically simulate and analyze the reliability and performance of complex engineered systems over time. For example, with RL, you can predict the reliability of a new mine conveyor system, evaluate the safety of a proposed space station, or determine the fault tolerance of a new network topology. You can access RL elements simply by creating a new model. For further examples, you can download RL models from the GoldSim Resource Center.

GoldSim Training Schedule

We will be holding open training sessions in our offices in Issaquah (Seattle) Washington on the following dates:

  • April 22-23rd
  • August 5-6th

The sessions will provide an introduction to GoldSim, and can serve as either a basic training for new users, or a refresher course for existing users.  The focus will be quite generic (as there will likely be attendees from multiple arenas).

The cost for these two-day training sessions is $1000 ($500 for academic users).  The sessions will include breakfast and lunch.  You must bring your own laptop (temporary training licenses will be provided).

If you are interested in attending one of these sessions, please contact us at

Partner Spotlight

Interview with Alvaro Buoro of Equinocio

Equinocio is a French consultancy providing numerical simulation services to support a better understanding of dynamic systems in environmental science, management and business.  GoldSim is the primary software used by Equinocio. Alvaro Buoro is the founder of the company.  He created Equinocio four years ago to explore new ways of proposing solutions to complex problems.  GoldSim is the primary software used by Equinocio.

Alvaro took some time to chat with us about GoldSim, modeling, and consulting.

Modeler's Corner

Using the Status Element to Track Boolean State Variables

Most real-world models involve tracking the status of various aspects of a system that are Boolean; that is, always in one of two possible states or conditions.  GoldSim provides a powerful element to easily facilitate this - the Status element. Status elements allow you to monitor the status of something that is changed instantaneously (i.e., is triggered) by events.

What's Cooking

A Quick List of Features in the Next GoldSim Release...

The next release of GoldSim (scheduled for release in the next several months) includes the following features:

  • Enhanced Dashboard capabilities, to make it simpler for users to build and edit powerful dashboards.
  • Enhanced tool tips and formula-editing capabilities, to make models easier to understand and debug.
  • New probability distributions and stochastic capabilities.
  • Faster, more-responsive editing and running of large models.
  • "Smart" contaminant transport elements that will accept data defined by either chemical element or by species, and by either moles or masses.
As always, we encourage user requests and suggestions. If you have specific feedback, please contact us at . You can unsubscribe or subscribe to this Newsletter at our website. 2008 GoldSim Technology Group LLC.