Created
April 13, 2024 16:22
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codigos da thais
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from decimal import * | |
def horner(p, x): | |
res = p[-1] # isto é o valor a_n | |
for i in range(len(p)-2, -1, -1): | |
res = res * x + p[i] | |
return res | |
def find_root(p, a, b, tolerance=Decimal('1e-10')): | |
if horner(p, a) * horner(p, b) > 0: | |
print("Não é possível garantir que há uma raiz no intervalo fornecido.") | |
return None | |
while abs(b - a) > tolerance: | |
midpoint = (a + b) / Decimal('2') | |
if horner(p, midpoint) == 0: | |
return midpoint | |
elif horner(p, a) * horner(p, midpoint) < 0: | |
b = midpoint | |
else: | |
a = midpoint | |
return (a + b) / Decimal('2') | |
# Configurando a precisão decimal | |
getcontext().prec = 3 | |
# Coeficientes do polinômio | |
p = [Decimal('1'), Decimal('-5.21287'), Decimal('-7.66759'), Decimal('33.35757')] | |
# Encontrando uma raiz do polinômio p(x) = 0 no intervalo [0, 1] | |
raiz = find_root(p, Decimal('0'), Decimal('1')) | |
print(f'Uma raiz de p(x) = 0 no intervalo [0, 1] é aproximadamente {raiz}') |
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