Send help for the world's easiest matlab code and for some reason I can't get it to work

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Muhammed Ahkbar 2017-5-14

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https://ww2.mathworks.cn/matlabcentral/answers/340197-send-help-for-the-world-s-easiest-matlab-code-and-for-some-reason-i-can-t-get-it-to-work

评论： Walter Roberson 2017-5-14

在 MATLAB Online 中打开

   function i = find_first(array, value)
     % FIND_FIRST Find first index of a value in an array.
     % I = FIND_FIRST(ARRAY, VALUE) returns the index I into the ARRAY where the
     % first occurrence of VALUE is found. If VALUE is not in ARRAY, then an
     % error is raised.
     n = length(array);
     i = 1;
     while ??? && ???
         i = i + 1;
  end
     %Check if value was not found
     if ???
         error('VALUE was not found.');
  end

I can't do it. What are the question marks supposed to be?

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Muhammed Ahkbar 2017-5-14

>> find_first([2,7,1,8,2,8,1], 8)

This is an example question for the function

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回答（1 个）

Walter Roberson 2017-5-14

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https://ww2.mathworks.cn/matlabcentral/answers/340197-send-help-for-the-world-s-easiest-matlab-code-and-for-some-reason-i-can-t-get-it-to-work#answer_266952

while your index is not past the end of the vector and the current value is not the match you are looking for

if your index is past the end of the vector

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mitch midalia 2017-5-14

Thank you very much, but I still don't understand why my function earlier wasnt working. Could you please explain? Thanks :)

Walter Roberson 2017-5-14

i <= n & array(i) ~= value

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MATLAB Language Fundamentals Matrices and Arrays Matrix Indexing

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