You can now save an optimization log to disk during the optimization. There is also a new action to first run a model, and then enter Stella Live, mimicking the behavior of the run button during model development (see Actions (Interface)). Simply set this option in the Interface Settings Properties Panel. We have added the ability to create an interface where Stella Live is always on. This effectively allows arbitrary residence time distributions which provides more accurate modeling in cases where the time in stock is variable. It is now possible to distribute the material over the conveyor following the contour in a graphical. Material coming into a conveyor is normally put at the beginning, then sent across the conveyor over the course of the simulation. The builtin MLPANN can be used to embed artificial neural nets in models to capture arbitrary nonlinear relationships. This is most useful for graphicals on the range of 0 to 1 representing probability density functions. The LOOKUPMEAN builtin can be used to compute the mean value of a graphical. There is an option in the Preferences Dialog to allow disabling of this feature and an option in the Model Settings Properties Panel to turn it off for a specific model. Hovering over the highlighted stock or flow will give a message showing what type of constraint was encountered. When a flow is forced to 0 because of a non-negative stock, both the flow and the stock will now highlight to show that this has happened. The table can be saved to html or copied to the clipboard in for pasting into a spreadsheet. The Equation Viewer will now display equations in a table, making it much easier to read and navigate through the listing. Stella will now create stock and flow diagrams, or fill in missing pieces, for models created in other applications and brought in to Stella. The software identifies the feedback loops important to generating behavior and allows you to create causal loop diagrams that display those loops in a simplified form. Understanding models has never been easier! Loops that Matter is new functionality in Stella 2 that allows you to immediately visualize the impact of every variable in a model on every other variable during the course of the simulation.
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