Output argument 'answers' (and maybe others) not assigned during call to "..."
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I am trying to create a function that sums up all the values of the fibonacci series using only recursion, but I keep getting this error message...
Output argument "answer" (and maybe others) not
assigned during call to "sum_of_fibo>fibo".
Error in sum_of_fibo (line 2)
summa = sum(fibo(n:-1:0));
Here's my code...can someone help?
function summa = sum_of_fibo(n)
summa = sum(fibo(n:-1:0));
end
function answer = fibo(n)
if n == 0
answer = 1;
elseif n == 1
answer = 1;
elseif n > 1
answer = fibo(n-1) + fibo(n-2);
end
end
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채택된 답변
Image Analyst
2020년 4월 15일
If you pass in something like -1 or 0.4, answer will never get set to anything. You should set it to something, even if it's null, to avoid that error. Better yet, make an "else" for your if to handle cases where you're passing in values that are not positive integers or zero.
function answer = fibo(n)
answer = []; % empty
if n == 0
answer = 1;
elseif n == 1
answer = 1;
elseif n > 1
answer = fibo(n-1) + fibo(n-2);
end
end
추가 답변 (1개)
Adam Danz
2020년 4월 15일
편집: Adam Danz
2020년 4월 15일
Any time you write if... elseif... statements you should always include a final else statement, even if you think you've covered every possibility. The final else statement can either define a default value for answer or in can throw an error.
Example 1
function answer = fibo(n)
if n == 0
answer = 1;
elseif n == 1
answer = 1;
elseif n > 1
answer = fibo(n-1) + fibo(n-2);
else
answer = -1; % Default value
end
Example 2
function answer = fibo(n)
if n == 0
answer = 1;
elseif n == 1
answer = 1;
elseif n > 1
answer = fibo(n-1) + fibo(n-2);
else
error('''n'' must be greater or equal to 0.') % throw error
end
댓글 수: 9
Adam Danz
2020년 4월 17일
Out of memory. The likely cause is an infinite recursion within the program.
Error in sum_of_fibo (line 5)
summa = fibo(n) + jff(n-1);
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