Difference between revisions of "Defining the population control: foxes capture hares"

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38. Click on Foxes at end node again. Press ctrl+e to open it's attribute pane
 
38. Click on Foxes at end node again. Press ctrl+e to open it's attribute pane
  
[[Image: Foxes at end attribute pane max.jpg]]
+
38.5 Change definition to ' Max([2,Min([Foxes_surviving,Foxes_at_start])]) '
  
 
39. Select 'Edit time' from the 'Definition' menu.
 
39. Select 'Edit time' from the 'Definition' menu.

Revision as of 07:21, 7 October 2010

1. Drag two variable nodes in the diagram, type ‘Hare capture rate’ and ‘Hares captured’ for the title.

Foxes and Hares diagram 1.6.jpg

2. Draw arrow from ‘Hare capture rate’ to ‘Hares captured’.

3. Draw arrow from 'Hares captured' to 'Hares at end'.

Foxes and Hares diagram 1.7.jpg

4. Double click on Hare capture rate to open its object window.

5. In the Description field type ‘Percentage of hares captured by each fox during a time period. Press tab.


6. In the Definition field type ‘25%’, press alt+enter.

Expected: Your object window should look like the screen shot below

Object hare capture.jpg

7. Select Hares captured. Select Description from the Attribute popup menu. Type ‘Number of hares captured during a time period’.

Foxes and Hares diagram 1.8.jpg

8. Draw arrows from both ‘Hares at end’ and ‘Foxes at end’ to ‘Hares captured’.

Expected: Your diagram should look like the screen shot below. If not, report the problem

Foxes and Hares diagram 1.9.jpg

9. Select Hares captured. Select Definition from the Attribute popup menu, type Dynamic(75,Hare_capture_rate*Hares_at_end[Time-1]*Foxes_at_end[Time-1]). Press alt+enter.

Foxes and Hares diagram 10.jpg

10. Click on the result button.

Expected:Result window should appear.

Result Hares captured.jpg

11. Close the Result window.

11.1 Select Hares at end on the digram 11.2 In the Attribute panel, edit the definition of Hares at end and change it to ' Hares_at_start - Hares_captured '.

12. Select 'Hares captured' press ctrl+e to open its attribute panel.

13. In the Attribute popup menu select Definition. Copy and paste this: Dynamic(75,Min([Hares_at_start-20,Hare_capture_rate*Hares_at_end[Time-1]*Foxes_at_end[Time-1]]))

14. Drag and drap 2 variable node, give it a title 'Hares needed by 1 fox' and 'Foxes surviving'

Hares needed by 1 fox.jpg

15. Click on arrow tool from the tool palette.

16. Drag arrow tool from 'Hares needed by 1 fox' to 'Foxes surving'

17. Drag and drop the mouse from 'Foxes surviving' to 'Foxes at end' to create an arrow.

Hares needed by 1 fox arrow.jpg

18. Click on edit tool palette again to switch to edit mode

19. Double click on 'Hares needed by 1 fox' node to open it's object window

20. Click on Identifier field and change definition to 'Hares_needed'

21. Press tab to go to 'Description' field

22. Type 'Number of hares that one fox must capture in a time period to survive'

23. Press tab key again to go down to 'Definition' field

24. Set definition to 10

25. Click on green arrow check box to accept definition. Close the Object window.

26. Double click on 'Foxes surviving' node to open it's object window

27. Click on tab key to go down to Description attribute and copy and paste this without the quotes 'Number of foxes surviving a time period, by eating the number of hares captured'

28. Press tab key again to move down to Definition field

29. Key in 'Hares_captured/Hares_needed'.

30. Press green check button to accept definition.

31. Close Object window.

Expected: Compare your result with screen shot below

Hares needed defined.jpg

32. Click on 'Foxes at end'.

33. Press ctrl+e to open it's attribute pane.

34. Key in 'Min([Foxes_surviving,Foxes_at_start])'

Foxes at end attribute pane.jpg

35. Click on check button to accept definition

36. Click 'Population' node.

37. Click show result button from the tool palette.

Expected: You should have the same result like the screen shot below

Populations.jpg

38. Click on Foxes at end node again. Press ctrl+e to open it's attribute pane

38.5 Change definition to ' Max([2,Min([Foxes_surviving,Foxes_at_start])]) '

39. Select 'Edit time' from the 'Definition' menu.

40. Click Sequence button

41. Change 'end' to 100. Click ok button.

42. Press ctrl+r to bring up result view


Expected: You should have the same result as the screen shot below

Time.png

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