I am trying to write a recursive code to check whether a string is palindrome or not, when i am running a trial case a error message shows up stating "he function call palindrome('madam') caused an error and did not complete (MATLAB:TooManyOutputs)".

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Harsh Mittal 2020-10-20

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评论： Harsh Mittal 2020-11-20

% I am writing a code to find the palindrome of a string using recursion but i am getting the error The function call palindrome('madam') caused an error and did not complete (MATLAB:TooManyOutputs)
function  palindrome(v)
    if length(v) <= 1
        true
        return;
    end
    if v(1) ~= v(end)
        false
        return;
    end
    palindrome(v(2:end-1));
end

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John D'Errico 2020-10-20

编辑：John D'Errico 2020-10-20

Does your function actually return ANY output argument?

What happens when you just type false or true on the command line? Does that return anything? Or does it just dump something to the command window?

I think you need to do some reading about functions and how to use them.

When you write a function header, one thing you need to do is tell MATLAB what variables to return.

Harsh Mittal 2020-11-20

Thanks for the help

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Answer 1

Stephen23 2020-10-20

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If you want to return an output argument then it must be declared in the function, e.g.:

function out = palindrome(v)
    if length(v) <= 1
        out = true;
        return
    end
    if v(1) ~= v(end)
        out = false;
        return
    end
    out = palindrome(v(2:end-1));
end