ContourPlot[ {x - y == 0, x - 2 y == 0}, {x, -4, 4}, {y, -4, 4}, Axes -> True, Frame -> False, AxesLabel -> {x, y}, PlotLegends -> {l1, l2} ]
转载于:https://my.oschina.net/xfan/blog/1809858
ContourPlot[ {x - y == 0, x - 2 y == 0}, {x, -4, 4}, {y, -4, 4}, Axes -> True, Frame -> False, AxesLabel -> {x, y}, PlotLegends -> {l1, l2} ]
转载于:https://my.oschina.net/xfan/blog/1809858