title: Undefined function 'minus' for input arguments of type table
body: <p>I have a .txt (220 rows * 12 cols, first row text, rest of the file is decimal numbers) file, first I converted it to a table:
  <code>T = readtable('xxx.txt','Delimiter','\t')</code>   and then saved T to .mat form.</p>
  
  <p>Then I ran these codes:</p>
  
  <pre><code>&gt;&gt; load T.mat
  &gt;&gt; col=0;
  raa=0.05;
  d=0;
  c=0;
  n=0;
  w=0;
  b=0;
  data4=zeros(220,10);
  
  
  
  for col=3:12
  
  for i=1:220
       b=0;
       c=0;
  
  for j=1:220
       if i~=j
             d=sqrt((T(i,1)-T(j,1))^2+(T(i,2)-T(j,2))^2);
              if d&lt;30              
              c=(1/(d^2))*T(j,col);
              b=b+c;
             else
             end
  
      end
    end
  
  x=T(i,col) - (raa * b);
  n=i;
  
  data4(i,col)= x;
    data4(i,1)=n;
  
     end
  
      %   dlmwrite('trash.txt',data4,'\t')
     dlmwrite('T-100spreg2-raa05.txt',data4,'\t')    
    end
  </code></pre>
  
  <p>I got an error message:</p>
  
  <blockquote>
    <p>Error: undefined function 'minus' for input arguments of type table.</p>
  </blockquote>
  
  <p>My questions are:</p>
  
  <ol>
  <li><p>why when I checked the size of T I got ans=1    1, why not ans=220   12?</p></li>
  <li><p>why I got this error message?</p></li>
  <li><p>If I shouldn't use table T directly in the code, then I need to convert it to an array. I used A=table2array('T') and got:
  Error: Cell contents reference from a non cell array object 
  Error in table2array (line 27) a = t{:,:};
  Could it be I did something wrong from the first step i.e. convert .txt to table (thus I got ans=1  1 but not 220 12)?</p></li>
  </ol>