How would I make my for loop more accurate.

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A C 2019-2-10

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回答： Walter Roberson 2019-2-10

a = 0;
b = 1;
c = 0;
d = 1;
for k = 1:700
    c = a + b;
    a = b;
    b = c;
    d = [d c];
end
format long
d(700)          %>>> 8.747081495575278e+145   
fibonacci(700)  %>>> 8.747081495575285e+145

I believe the function fibonacci(n) has the correct number.

How does the function fibonacci have a more accurate number?

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Answer 1

Walter Roberson 2019-2-10

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https://ww2.mathworks.cn/matlabcentral/answers/444140-how-would-i-make-my-for-loop-more-accurate#answer_360335

fibonnaci() is a function in the Symbolic Toolbox. It calculates the numbers as indefinite precision software integers, and then converts the result to double.