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bc/examples/phi.bc

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define phi(x) {
t = 0
s = x
b = x
q = x * x
i = 1
while (s != t) {s = (t = s) + (b = b * (q / (i = i + 2)))}
const = 0.5 * l(8 * a(1))
0.5 + s * e(-0.5 * q - const)}
phi(1)