I'm getting "Index exceeds array bounds." and I'm not sure how to fix it.

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Benjamin Scott
Benjamin Scott 2018-5-16
评论： Benjamin Scott 2018-5-17
Here's the problem.
One interesting property of a Fibonacci sequence is that the ratio of the values of adjacent members of the sequence approaches a number called “the golden ratio” or Φ (phi). Create a program that accepts the first two numbers of a Fibonacci sequence as user input, then calculates additional values in the sequence until the ratio of adjacent values converges to within 0.001. You can do this in a while loop by comparing the ratio of element k to element k – 1, and the ratio of element k – 1 to element k – 2. If you call your sequence x, then the code for the while statement is
whileabs(x(k)/x(k−1) − x(k−1)/x(k−2))+0.001
This is my code.
%9.8
first_input = input('Enter the first number ');
second_input = input('Enter the second number ');
x(1)=first_input;
x(2)=second_input;
k=3;
while abs((x(k)/x(k-1)) - (x(k-1)/x(k-2)))>0.001
x(k)=x(k-2)+x(k-1);
k=k+1;
end
disp(x)

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采纳的回答

Walter Roberson
Walter Roberson 2018-5-16
You need to calculate x(3) from x(1) and x(2) before you start the while loop.
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Walter Roberson
Walter Roberson 2018-5-16
When k = 3, you assign to x(k) which is x(3), which already has a value. Then you increment k to 4 and try to access x(k) which is x(4) which has not been defined.
Hint: move the increment of k to before the assignment.

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