Simple question about functions

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Danny C
Danny C 2016-8-30
编辑： Geoff Hayes 2016-9-2
function nFib = fib(n)
a = (1 + sqrt(sym(5)))/2;
nFib = (a^n)-((-a)^(-n)) / sqrt(sym(5)) ;
end
*The output for this function when n=3 is
fib(3)
ans =
5^(1/2)/(5*(5^(1/2)/2 + 1/2)^3) + (5^(1/2)/2 + 1/2)^3
Why isn't the answer showing the number but just the entire function itself? And how can I solve this problem to show the actual answer(in number)? Thank you!

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采纳的回答

Andrei Bobrov
Andrei Bobrov 2016-8-30
function nFib = fib(n)
a = (1 + sqrt(5))/2;
nFib = a^n-(-a)^(-n) / sqrt(5) ;
end
  2 个评论
Danny C
Danny C 2016-8-30
Now it's working. Would you mind telling me what was wrong in my function?
Andrei Bobrov
Andrei Bobrov 2016-8-30
I replaced the symbolic expression (sym(5)) to a value of integer 5.

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