%vykresli primky z rovnic v matici la
function drawLin(la,row,col)
for i=1:size(la,2)
   li=la(:,i);
   if(abs(li(1))>abs(li(2)))
      line([-100*col,100*col],[-(-li(2)*col*100+li(3))/li(1), -(li(2)*col*100+li(3))/li(1)]);
   else
      line([-(-li(1)*row*100+li(3))/li(2), -(li(1)*row*100+li(3))/li(2)],[-100*row,100*row]);
   end
end
