程序如下：%画标准式样的疲劳极限图x=[0,577.5,1125];y=[534,472.5,0];p=polyfit(x,y,3);X=0:0.01:1125;Y=polyval(p,X);plot(x,y,’*’,X,Y)hold onx1=[0,528.4234,1060];y1=[459.6200,432.3464,0]p1=polyit(x1,y1,3)X1=0:0.01:1060;Y1=polyval(p1,X1);plot(x1,y1,’*’,X1,Y1,’--’)x2=[0,626.5766,1190];y2=[608.3800,512.6536,0];p2=polyfit(x2,y2,3)X2=0:0.01:1190;Y2=polyval(p2,X2);plot(x2,y2,’*’,X2,Y2,’--‘,X2,472.5/577.5*X2)%画轴的疲劳极限图i=[0,577.5,1125];P=polyfit(i,j,3)I=0:0.01:1125;J=polyval(P,,I)plot(i,j,’*’,I,J)i1=[0,577.5,1060];j1=[167.85,150.1,0];P1=poltfit(i1,j1,3)I1=0:0.01:1060;J1=polyval(P1,I1);plot(i1,j1,’*’,I1,J1,`--`)i2=[0,577.5,1190];j2=[359.75,316.71,0];P2=polyfit(i2,j2,3)I2=0:0.01:1190;J2=polyval(P2,I2);Plot(i2,j2,’*’,I2,,J2,’--‘,I2,73.52/29.58*12)xlabel(‘om’)ylabel(‘oa’)gtext(‘r*=-0.426’); gtext(‘M’);gtext(‘N’);hold off运行后出现??? plot(x,y,’*’,X,Y) |Error: Missing variable or function.的提示，MATLAB高手求解？
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