ifx(1)<=0 x(i+1)=x(①-0.01； yi+1)y(①)-y1(①)/x1(①*0.01， end end if(abs(x(1)>0.0001)l(y(1)<0) plot(x,y); axis([-44-44]) hold on end end if x(1)<=0 x(i+1)=x(i)-0.01; y(i+1)=y(i)-y1(i)/x1(i)*0.01; end end if (abs(x(1))>0.0001) | (y(1)<0) plot(x,y); axis([-4 4 -4 4]); hold on end end