MATLAB: How to split a vector into smaller vectors to run a recursive function more efficiently

recursivesplit vector

I would like to split a vector of numbers v = 1:1e6 into smaller subvectors, say 20 elements each, and then be able to do a recursive function of reversing the elements in each of those smaller subvectors. Please help!

Best Answer

Try this

v = 1:1e6;
n = 20;
v_parts = mat2cell(v, 1, n*ones(1,numel(v)/n));
v_parts_reversed = cellfun(@fliplr, v_parts, 'UniformOutput', 0);

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MATLAB: Reverse character array using recursion

I assume this is homework so I'm hesitant even answering the question since the whole purpose of the exercise is to make you think of a recursive algorithm.

It is trivial to reverse a string by recursion: take the first element of the string, put it at the end of the string returned by calling the recursive function with the rest of the string (from character 2 to end). The recursion stops when the function receives only 1 character.

MATLAB: Recursive function to reverse a vector

Hmm. Suppose you strip off the last digit of the vector on each pass? Can you do that? You already know how to find the last element of a vector. That is just v(end). Your logic would look something like the logic in your digit_sum problem.

function vrev = reversal(v)
  if length(v) <= 1
    vrev = v;
  else
    % here, you need to break v into two pieces. 
    % one of those peieces will be the final element of v.
    % The other will be everything else.
    % then you can build up the vector, appending
    % the last element to the BEGINNING of the result.
    
    % take a shot at it, and I will look back in...
  end
end

Best Answer

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