write a recursive palindrome function but the error is always not enough input arguments

Question

Christine 2023-7-12

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https://ww2.mathworks.cn/matlabcentral/answers/1994868-write-a-recursive-palindrome-function-but-the-error-is-always-not-enough-input-arguments

编辑： Stephen23 2023-7-12

function p=palindrome(n)
if length(n)==1
    p==true
elseif n(1:end)==palindrome(end:-1:1)
    p=true
else p=false
end

i am very new to matlab (started a week ago) and tried this code and the error is always not enough input arguments i tried searching the meaning but didn't understand it fully and i don't know how to fix it

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Stephen23 2023-7-12

编辑：Stephen23 2023-7-12

"write a recursive palindrome function..."

You created a function named PALINDROME, which accepts one input argument:

function p=palindrome(n)

Then later you call the function recursively:

.. palindrome(end:-1:1)

But what is END supposed to refer to? It looks like you are trying to use END to index into a vector... but what vector?

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Answer 1

Malay Agarwal 2023-7-12

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编辑：Malay Agarwal 2023-7-12

在 MATLAB Online 中打开

Hi @Christine,

Please use the following function. Your code is missing an end to end the function defintion. There are also logical errors in the code, like the condition used in the elseif. Note that you need to pass n as a character vector.

n = 'abba';
palindrome(n)
ans = logical
   1
n = 'abc';
palindrome(n)
ans = logical
   0
function p = palindrome(n)
    % If empty or a single character, trivial palindrome
    if length(n) <= 1
        p = true;
    % Compare the first and last characters, and recursively compare the
    % rest of the string
    elseif n(1) == n(end) && palindrome(n(2:end-1))
        p = true;
    else 
        p = false;
    end
end

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Answer 2

Swapnil Tatiya 2023-7-12

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在 MATLAB Online 中打开

Hi @Christine,

I'm guessing the error shows up because you're passing an integer (n) as an argument and not an array of integers and you're assuming the digits to be different indices of that integer,but that's not the case in MATLAB.

The following code should help you in knowing whether an integer or a string is a palindrome:

function p=palindrome(n)
x=string(n);
if isequal(x,reverse(x))
    p=true;
else
    p=false;
end
end

Hope this helps!

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write a recursive palindrome function but the error is always not enough input arguments

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