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Nadir Arada - (Cálculo Numérico) - Portal de docentes FCT/UNL

Nadir Arada - (Cálculo Numérico) - Portal de docentes FCT/UNL

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Problema <strong>de</strong> Cauchy Derivada numérica Aproximação Euler Estabilda<strong>de</strong> Runge-Kutta 2 Runge-Kutta 4<br />

Seja Ei = |ei|. Tem-se<br />

Ei+1 ≤ (1 + Lh) Ei + hτ(h)<br />

≤ (1 + Lh)((1 + Lh) Ei−1 + hτ(h)) + hτ(h)<br />

= (1 + Lh) 2 Ei−1 + (1 + (1 + Lh)) hτ(h)<br />

≤ (1 + Lh) 2 ((1 + Lh) Ei−2 + hτ(h)) + (1 + (1 + Lh)) hτ(h)<br />

= (1 + Lh) 3 <br />

Ei−2 + 1 + (1 + Lh) + (1 + Lh) 2<br />

hτ(h)<br />

<br />

≤ 1 + (1 + Lh) + (1 + Lh) 2 + · · · + (1 + Lh) i<br />

hτ(h)<br />

= (1+hL)i+1 −1<br />

hL<br />

<strong>Cálculo</strong> <strong>Numérico</strong> - Équações diferenciais ordinárias<br />

hτ(h) = (1+hL)i+1 −1<br />

L<br />

τ(h)

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