Matlab畫圖增加右邊坐標軸的刻度，與左邊一樣，如何處理？

如圖，我希望右邊的Y軸刻度與左邊一樣，如何實現？ 雖然plotyy可以實現增加右邊的軸的刻度，但顏色會變，且必須是兩條或以上數量的曲線，我只有一條曲線，如何實現右邊軸上標上數字？

x = 1:0.5:4;
y = 2.*x;
plot(x,y, ".-b", "MarkerSize", 20, "LineWidth", 0.1)
grid on
xlim([0 6])
ylim([-5 12])
ax = gca;
ax.YTick = [1:0.5:9];


x = 1:0.5:4;
y = 2.*x;
[hAx,hLine1,hLine2] = plotyy(x,NaN(size(x)),x,NaN(size(x)));
hold on;
plot(x,y, ".-b", "MarkerSize", 20, "LineWidth", 0.1);
hAx(1).YTick = 1:0.5:9;
hAx(2).YTick = 1:0.5:9;
hAx(1).XLim = [0, 6];
hAx(2).XLim = [0, 6];
hAx(1).YLim = [-5, 12];
hAx(2).YLim = [-5, 12];
hAx(1).YColor = "k";
hAx(2).YColor = "k";
grid on;


x = 1:.5:4;
y = 2*x;
plot(x,y,"b.-","MarkerSize",25)
xlim([0 6]), grid on, yyaxis right
set(get(gca,"YAxis"),"Color","k","TickValues",1:.5:9,"Limits",[-5 12])


老版本可以用 plotyy：

x = 1:.5:4;
y = 2*x;
ax = plotyy(x,y,nan+x,nan+y,@(x,y)plot(x,y,".-b","markersize",25));
set(ax,"YColor","k","Ytick",1:.5:9,"Ylim",[-5 12],"Xlim",[0 6]), grid on