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Web skærmformat. - Aarhus Universitet

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IV. Differentialligninger – 3. Generelle metoder 355<br />

dW<br />

= −0.02W + 0.0002RW<br />

dt<br />

prøver vi at tilnærme løsningen med differentialet.<br />

I et givet punkt (Rn,Wn) vil differentialet være<br />

dR = (0.08Rn − 0.001RnWn)dt<br />

dW = (−0.02Wn + 0.0002RnWn)dt<br />

3.17. Eulers metode ☞ [S] 7.6 Predator-prey systems<br />

Eksempel 1 - Eulers metode<br />

Tabellæg løsning til R = 1000 og W = 75 månedsvis:<br />

n Rn Wn<br />

0 1000 75<br />

1 1005 75<br />

2 1010 75<br />

3 1015 75<br />

4 1020 75<br />

5 1025 75<br />

6 1030 75<br />

n Rn Wn<br />

7 1035 75<br />

8 1040 75<br />

9 1045 75<br />

10 1050 75<br />

11 1055 75<br />

12 1060 75<br />

13 1065 76<br />

n Rn Wn<br />

14 1069 76<br />

15 1074 76<br />

16 1079 76<br />

17 1083 76<br />

18 1087 76<br />

19 1091 76<br />

20 1095 76<br />

3.18. Grafisk ☞ [S] 7.6 Predator-prey systems<br />

Eksempel

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