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Web skærmformat. - Aarhus Universitet

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II. Integration – 1. Dobbelt integral 176<br />

1.21. Approximation ☞ [S] 5.9 Approximate integration<br />

Trapezreglen<br />

b<br />

n<br />

f(x)dx ≈ (f(xi−1) + f(xi)) ∆x<br />

2<br />

Simpsons regel<br />

a<br />

b<br />

f(x)dx ≈<br />

a<br />

n<br />

i=1<br />

i=1<br />

(f(x2i−2) + 4f(x2i−1) + f(x2i)) ∆x<br />

3<br />

1.22. Approximation ☞ [S] 5.9 Approximate integration<br />

Figur<br />

f(x2i 2)<br />

x2i 2<br />

x2i 1<br />

f(x2i)<br />

x2i<br />

f(x2i 1)<br />

x

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