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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 />

Exemplo 3. Consi<strong>de</strong>re o problema <strong>de</strong> Cauchy do Exemplo 1. O<br />

método <strong>de</strong> Euler modificado associado a este problema escreve-se<br />

ui+1−ui<br />

h<br />

u0 = 5<br />

Uma vez que<br />

= f ti + h<br />

2 , ui + h<br />

2 f (ti, ui) <br />

f ti + h<br />

2 , ui + h<br />

= − 2<br />

5<br />

= − 2<br />

5<br />

= − 2<br />

5<br />

2 f (ti, ui) <br />

<br />

ui + h<br />

2 f (ti, ui) + sin 5ti + 5h<br />

2<br />

ui + h<br />

2<br />

1 − h<br />

5<br />

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

i = 0, 1, · · · , n − 1<br />

<br />

2 − 5ui + sin(5ti) + sin 5ti + 5h<br />

2<br />

<br />

ui − h<br />

5 sin (5ti) + sin 5ti + 5h<br />

<br />

2

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