After you do that, you'll see that Population has a small graph inside of it: In the equation box, type in 25, and in the Units box, type in Critters (or Frogs, or Rabbits, or any other species you'd like).Ĭlick on the Run button in the Run toolbar at the bottom of the program.
Type in "Population" where the stock uses the default name (Stock 1).Ĭlick on at the bottom of the panel, and you'll see the equation panel: Our main, and only, stock is population, and putting down stocks is almost always the best way to get started building models.Ĭlick on the Stock tool ( or ) on the Build toolbar at the top, then click in the upper middle part of the white area below. As we progress, we'll fill in a few of the details around this formulation to make the complete model. While planning out a model normally takes significant time and thought, in this case we'll jump to a very simple structure: essentially just population, births, deaths, and an effect from crowding. We want to model population growth in the face of a limited carrying capacity. Make sure that Start Time is 0 and DT is 1/4, with Fractional checked (normally these will already be this way). In the panel to the right, change the Stop Time to 100. If you have Stella Architect, and are in the interface window, go to the model window (select Open Model window from the Window menu, or click on in the Build toolbar). If you have Stella Professional, start it. It doesn't matter which you use for this model. Note that, depending on your selection when you first started the software, you may get Stock or Non-Negative Stock and Biflow or Flow in the toolbar.
#Model so2 from factory stella architect software#
It's intended as a quick introduction to using the modeling software with step by step instructions. In this tutorial, we'll walk through the mechanics of building a simple population model. Model Building Tutorial Model Building Tutorial
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