Get It
Vensim 6.4 is available for download or purchase in the Vensim Store.
Upgrades are easy – just visit the download page and enter your license key information.
- If your maintenance is current, you can download immediately.
- If you don’t have a current license, you can extend your maintenance easily – just follow the Upgrade link that will be generated.
- Can’t find your license? Need other options? No problem – contact sales at vensim@vensim.com for help, volume quotes and other information.
What’s New?
Optimization improvements
- All optimization settings, including MCMC, stochastic optimization and extended payoff types are now available directly from the user interface. See the sections on Payoff Definitions and Optimization for more details.
- Payoff reports have been improved.
- A new payoff type permits elements that contribute to Kalman filter updates but not to the optimization payoff.
- Payoffs now skip points with NA values of model variables.
- Minor bug fix to prevent randomization of MCMC internal processes.
- Faster payoff computation.
- Kalman filter stability has been improved, particularly for models with many measurements and few states.
Sensitivity simulation improvements
- The VECTOR distribution has new options for testing only endpoints.
- Improved distribution parameter validation.
- Enhanced data export – see next item.
- Data import/export – new functionality makes it easier to work with enterprise data sources, statistics, visualization and business intelligence packages.
- Vensim can now import and export two new data types, relational and tidy. See: VDF2DLIST, VDF2TIDY, DLIST2VDF, TIDY2VDF.
- Sensitivity simulation export has been greatly enhanced, and also includes tidy and relational formats – see SENS2FILE.
- The Runs Compare tool can now be used with non-simulation sources (i.e. .vdf files from data).
- Many bug fixes on the Mac.