Why am I getting a "Not enough input arguments." error in my function?

Question

Nicholas Colburn 2013-2-20

0
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https://ww2.mathworks.cn/matlabcentral/answers/64327-why-am-i-getting-a-not-enough-input-arguments-error-in-my-function

Not really familiar with MATLAB but I have a couple of sorting functions and would like to compare their running times with the function FindRunningTime:

      function t = FindRunningTime(SortAlg)
          n = 10000.*randn(1,20);
          if strcmp(SortAlg, 'InsertionSort')
              tic;
              InsertionSort(n);
              t = toc;
          else
              tic;
              MergeSort(n);
              t = toc;
          end %if
      end %FindRunningTime

where SortAlg is specified as merge or insert. However when running the code I get the error "Not enough input arguments." on line 2 of both sorting algs. Hopefully someone could point me in the right direction. Also if anyone knows of a nice way to specify the random number generators range, that would be helpful. Below is the code for both sorting algorithms:

function list = MergeSort(list)
      if numel(list) <= 1
          return
      else
          middle = ceil(numel(list) / 2);
          left = list(1:middle);
          right = list(middle+1:end);
          left = sort(left);
          right = sort(right);
          if left(end) <= right(1)
              list = [left right];
              return
          end
          %merge(left,right)
          counter = 1;
          %index placeholder for final list
          while (numel(left) > 0) && (numel(right) > 0)
              if(left(1) <= right(1))
                  list(counter) = left(1);
                  left(1) = [];
              else
                  list(counter) = right(1);
                  right(1) = [];
              end           
              counter = counter + 1;   
          end
          if numel(left) > 0
              list(counter:end) = left;
          elseif numel(right) > 0
              list(counter:end) = right;
          end
          %end merge        
      end %if
  end %MergeSort
function list = InsertionSort(list)
      for i = (2:numel(list))
          value = list(i);
          j = i - 1;
          while (j >= 1) && (list(j) > value)
              list(j+1) = list(j);
              j = j-1;
          end %while
          list(j+1) = value;
      end %for
  end %InsertionSort

2 个评论
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Jan 2013-2-21

编辑：Jan 2013-2-21

The line 2 of MergeSort is empty, so I do not believe that it causes an error. Please post the complete error message also instead of describing it.

What do you mean by "specify the random number generators range"?

Nicholas Colburn 2013-2-21

编辑：Nicholas Colburn 2013-2-21

Apologies, that would be line 3 of both sorts. Here is the error, it's the same for both; there isn't much to it:

"Error using InsertionSort (line 3) Not enough input arguments."

As far as your second question, I would like to generate a sequence of numbers between 0 and 10,000 using (I'm assuming) some form of the rand() function.

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