How to fix the error?

num1 =[1 1 1 1 0 1;
1 1 1 1 0 1;
1 1 1 1 0 1;
1 1 1 1 0 1;
1 1 1 1 0 1;
1 1 1 1 1 1];
num2 =[1 1 0 0 0 1;
1 1 1 1 0 1;
1 1 0 0 0 1;
1 1 0 1 1 1;
1 1 0 0 0 1
1 1 1 1 1 1];
num3 =[1 1 0 0 0 1;
1 1 1 1 0 1;
1 1 0 0 0 1;
1 1 1 1 0 1;
1 1 0 0 0 1
1 1 1 1 1 1];
num4 =[1 1 0 1 0 1;
1 1 0 1 0 1;
1 1 0 0 0 1;
1 1 1 1 0 1;
1 1 1 1 0 1;
1 1 1 1 1 1];
num5 =[1 1 0 0 0 1;
1 1 0 1 1 1;
1 1 0 0 0 1;
1 1 1 1 0 1;
1 1 0 0 0 1;
1 1 1 1 1 1];
num6 =[1 1 0 0 0 1;
1 1 0 1 1 1;
1 1 0 0 0 1;
1 1 0 1 0 1;
1 1 0 0 0 1;
1 1 1 1 1 1];
num7 =[1 1 0 0 0 1;
1 1 1 1 0 1;
1 1 1 1 0 1;
1 1 1 1 0 1;
1 1 1 1 0 1;
1 1 1 1 1 1];
num8 =[1 1 0 0 0 1;
1 1 0 1 0 1;
1 1 0 0 0 1;
1 1 0 1 0 1;
1 1 0 0 0 1
1 1 1 1 1 1];
num9 =[1 1 0 0 0 1;
1 1 0 1 0 1;
1 1 0 0 0 1;
1 1 1 1 0 1;
1 1 1 1 0 1;
1 1 1 1 1 1];
num0 =[1 1 0 0 0 1;
1 1 0 1 0 1;
1 1 0 1 0 1;
1 1 0 1 0 1;
1 1 0 0 0 1;
1 1 1 1 1 1];
multiplication =[1 0 1 1 1 0;
 1 1 0 1 0 1;
 1 1 1 0 1 1;
 1 1 0 1 0 1;
 1 0 1 1 1 0;
 1 1 1 1 1 1];
division =[1 1 1 0 1 1;
 1 1 1 1 1 1;
 1 0 0 0 0 0;
 1 1 1 1 1 1;
 1 1 1 0 1 1;
 1 1 1 1 1 1];

   equals=[1 1 1 1 1 1;
   1 1 1 1 1 1;
   1 0 0 0 0 0;
   1 1 1 1 1 1;
   1 0 0 0 0 0;
   1 1 1 1 1 1];
  decimal =[1 1 1 1 1 1;
   1 1 1 1 1 1 ;
   1 1 1 1 1 1 ;
   1 1 1 0 1 1 ; 
   1 1 1 1 1 1 ;
   1 1 1 1 1 1];
  spacing =[1 1 1 1 1 1;
  1 1 1 1 1 1; 
  1 1 1 1 1 1; 
  1 1 1 1 1 1; 
  1 1 1 1 1 1;
  1 1 1 1 1 1];
  a = [];
  b = [];
  c = [];
  solution = 0;
  exit = 0;
  n = 1;
  signs = {};
  solutions = [];
  strarray = '';
  strarrays = [];
  jpegimg = [];
  jpegfinal = [];
  x=9999999999999999999999999999999999;

while(exit == 0) 
    inputa = input('insert your value of a: ');
    while 1
        inputb = input('insert your value of b: ');
        inputc = input('insert your value of c: ');
        sign = input('Enter 1 for multiplication or 2 for division: ');
        if inputb == 0 && sign == 1 
            continue;
        else
            break;
        end
        if inputc == 0 && sign == 1
            continue;
        else 
            break;
        end 
    end
     a{n} = num2str(inputa);
     if sign == 1
         signs = '/';
        solution = inputa/inputb/inputc;
    else
        signs = '*';
        solution = inputa*inputb*inputc;
    end
    b = num2str(inputb); 
    if sign == 1 
        signs = '/';
        solution = inputa/inputb/inputc;
    else
        signs = '*';
        solution = inputa*inputb*inputc;
    end
    c{n} = num2str(inputc); 
    solutions{n} = num2str(solution);
    %a = pad(a 'left');
%b = pad(b, 'right');
%solutions = pad(solutions, 'right');

      strarray = num2str(inputa);
      strarray = horzcat(strarray,  signs);
      strarray = horzcat(strarray, num2str(inputb));
      if(length(inputc) ~= 0)
          strarray = horzcat(strarray, signs);
          strarray = horzcat(strarray, num2str(inputc));
      end

      nowlength = length(strarray)+length(num2str(solution))
      if(length(strarrays) > nowlength)
          spacereq = length(strarrays) - (nowlength);
          disp(spacereq)
          strarray = horzcat(strarray, blanks(spacereq))
      end

      if(length(inputb) ~= 0 || length(inputc) ~= 0)
          strarray = horzcat(strarray, '=');
          strarray = horzcat(strarray, num2str(solution));
      end

          strarrays = char(strarray)
      disp(strarrays);
      exit = input('Enter 0 to k}eep proceeding and 1 to exit: ');
      if exit == 0 
          n = n + 1;
      end
  end
  disp('list');
  % strarrays = string(char(strarrays));
  % We cant use string because Matlab remove them in 2012;
  % HELP
  jpegimg=[]
  for list = 1:length(strarrays)
      disp(strarrays)
      arrstr = strarrays(list);

      for m = 1:length(arrstr)
          disp(arrstr(m));
          switch(arrstr(m))
              case '0'
                  jpegimg = [jpegimg, num0];
                  disp(num0);
              case '1'
                  jpegimg = [jpegimg, num1];
                  disp(num1);
              case '2'
                  jpegimg = [jpegimg, num2];
                  disp(num2);
              case '3'
                  jpegimg = [jpegimg, num3];
                  disp(num3);
              case '4'
                  jpegimg = [jpegimg, num4];
                  disp(num4);
              case '5'
                  jpegimg = [jpegimg, num5];
                  disp(num5);
              case '6'
                  jpegimg = [jpegimg, num6];
                  disp(num6);
              case '7'
                  jpegimg = [jpegimg, num7];
                  disp(num7);
              case '8'
                  jpegimg = [jpegimg, num8];
                  disp(num8);
              case '9'
                  jpegimg = [jpegimg, num9];
                  disp(num9);
              case '*'
                  jpegimg = [jpegimg, multiplication];
              case '/'
                  jpegimg = [jpegimg, division];
              case '='
                  jpegimg = [jpegimg, equals];
              case '.'
                  jpegimg = [jpegimg, decimal];
              case ' '
                  jpegimg = [jpegimg, spacing];
          end
      end
      for i = 1:(66 - size(jpegimg, 2)) / 5
          jpegimg = [jpegimg, spacing];
      end
      jpegimg = [jpegimg ,spacing];
      if(isempty(jpegfinal))
          jpegfinal = jpegimg;
      else
          jpegfinal = [jpegfinal; jpegimg];
          jpegimg = [];
      end
  end

%a = pad(a 'left');
%b = pad(b, 'right');
%solutions = pad(solutions, 'right');
%  
% disp('list?');
% for list = 1:length(inputp)
%     strarray = num2str(inputa);
%     strarray = horzcat(strarray, signs{list});
%     strarray = horzcat(strarray, num2str(inputb));
%     if(length(inputc) ~= 0)
%         strarray = horzcat(strarray, signs{list});
%         strarray = horzcat(strarray, num2str(inputc));
%     end
%     if(length(inputb) ~= 0 || length(inputc) ~= 0)
%         strarray = horzcat(strarray, '=');
%         strarray = horzcat(strarray, num2str(solution));
%     end
%     strarrays{list} = strarray;
%     disp(strarrays);
% end
% 
% disp('elist?');
% % strarrays = string(char(strarrays));
% % We cant use string because Matlab remove them in 2012;
% % HELP
% 
% for list = 1:length(strarrays)
%     numstring = strarrays{list};
%     for m = 1:length(numstring)
%         disp(numstring(m));
%         switch(char(numstring(m)))
%             case '0'
%                 jpegimg = [jpegimg num0];
%                 disp(num0);
%             case '1'
%                 jpegimg = [jpegimg num1];
%                 disp(num1);
%             case '2'
%                 jpegimg = [jpegimg num2];
%                 disp(num2);
%             case '3'
%                 jpegimg = [jpegimg num3];
%                 disp(num3);
%             case '4'
%                 jpegimg = [jpegimg num4];
%                 disp(num4);
%             case '5'
%                 jpegimg = [jpegimg num5];
%                 disp(num5);
%             case '6'
%                 jpegimg = [jpegimg num6];
%                 disp(num6);
%             case '7'
%                 jpegimg = [jpegimg num7];
%                 disp(num7);
%             case '8'
%                 jpegimg = [jpegimg num8];
%                 disp(num8);
%             case '9'
%                 jpegimg = [jpegimg num9];
%                 disp(num9);
%             case '*'
%                 jpegimg = [jpegimg multiplication];
%             case '/'
%                 jpegimg = [jpegimg division];
%             case '='
%                 jpegimg = [jpegimg equals];
%             case '.'
%                 jpegimg = [jpegimg decimal];
%             case ' '
%                 jpegimg = [jpegimg spacing];
%         end
%     end
%     for i = 1:(66 - size(jpegimg, 2)) / 5
%         jpegimg = [jpegimg spacing];
%     end
%     temp = [1;1;1;1;1];
%     jpegimg = [jpegimg temp];
%     if(isempty(jpegfinal))
%         jpegfinal = jpegimg;
%     else
%         jpegfinal = [jpegfinal; jpegimg];
%         jpegimg = [];
%     end
% end
imshow(jpegfinal);

[Rik]

Have a read here (or here for more general advice) and here. It will greatly improve your chances of getting an answer.

[Walter Roberson]

I know that I for one am not going to study the code line by line looking for all of the possible errors. You should post an error message.