22 lines
348 B
Python
22 lines
348 B
Python
from math import sqrt
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def pq(p,q):
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a = -p/2
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b = sqrt(a**2-q)
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return (a+b,a-b)
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(l1,l2) = pq(-1,-1)
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c2 = -l1/(l2-l1)
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c1 = 1-c2
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c1 *= l1
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c2 *= l2
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fib = lambda k: int(c1*pow(l1,k) + c2*pow(l2,k))
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if __name__ == '__main__':
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print("fib(k) = (%f) * (%f)^k + (%f) * (%f)^k)" % (c1,l1,c2,l2))
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for i in range(0,51):
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print("%d: %d" %(i,fib(i)))
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y |