X = [1 -1 2 -1;
     1 -1 -1 1;
     1 2  3 -1];

for i = 1:size(X, 2)
   column = X(:, i);
   idx = find(column > 0, 1);
   if idx == 1
       continue
   end
   if isempty(idx)
       X(:,i) = X(:,i)*0;
       continue
   end
   column(1:idx-1) = 0;
   column = circshift(column, -idx+1);
   X(:, i) = column;
end

X