matlab 画折线图

x=[0.236592,  0.364956,  0.549907,  0.793017,  1.104042,  1.315337,  1.494668 ]; 
y=[29.497839, 31.321272, 33.359264, 35.488258, 37.650269, 38.865906, 39.707176]; 
plot(x,y,'-*b'); 
axis([0,1.7, 27, 41])  %确定x轴与y轴框图大小
ax = gca;
ax.XTick = [0.1:0.1:1.7]; %x轴范围
ax.YTick = [27:1:41]; %y轴范围
grid on
xlabel('Bpp')  
ylabel('PSNR')