Defining the fox population as a function of time

• Double click ‘Foxes at start’ node.

Expected: Object window should appear.

• In the Description field type ‘The fox population at the start of each time period’.

• In the Definition field copy / paste without quotes ' Dynamic(6,Foxes_at_end[Time-1]*(1+Fox_birth_rate)) '. Click green check button to accept the definition.

• Double click ‘Foxes at end’.

Expected: Object window should appear.

• . Type ‘The fox population at the end of each time period’ in the Description field.

• Click the Definition field. Click ‘Inputs’ popup menu button, select ‘Foxes_at_start’.

• ‘Foxes_at_start’ should appear on the Definition field. Click on the check button to accept your entry. Click on the diagram button.

• With the Foxes at end node selected, click on the result button. Result window should appear.

See Also

• Tutorial: Dynamic system model
• Creating the Foxes and Hares model (based on chapter 7 of tutorial)