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请教各位大虾啦!!matlab中的问题Missing variable or function.

??? Error: File: D:\matlab\one.m Line: 17 Column: 11

Missing variable or function.是什么意思啊?

源程序是:%machine characteristic %p109 machine parameter

clear;

m1=3;

U=220*sqrt(3);

R1=0.055;

R2=0.04;

P=2;

f=50;

omega=2*pi*f/P;

X1=0.265;

X2=0.565;

s=0.005:0.005:1;

Te=(m1*P*U1^2*R2)./s./(omega.*((R1+R2./s).^2.+(X1+X2)^2));

figure(1)

plot(s,Te,`k-`);

xlabel(`转差率s`);

ylabel(`电磁转矩Te/(N.m)`);

str_x=0.02;

text(str_x,max(Te)+100,strcat(`U1=`,num2str(int16(U1)),`V`),`Color`,`black`);

title(`改变定子电压时的人为机械特性`);

hold on;

for coef=0.75:-0.25:0.25

U1p=U1*coef;

Telt=(m1*P*U1p^2*R2)./s./(omega.*((R1+R2./s).^2.+(X1+X2)^2));

plot(s.Te1,`k-`);

str=strcat(`U1=`,num2str(int16(U1p)),`V`);

str_y=max(Te1)+100;

text(str_x,str_y,str,`Color`,`black`);

end

figure(2)

plot(s,Te,`k-`);

xlabel(`转差率S`);

ylabel(`电磁转矩Te/(N.m)`);

str_x=0.75;

str_y=Te(length(Te));

text(str_x,str_y,strcat(`R2=`,num2str(R2),`\Omega`),`Color`,`black`);

title

hold on;

for coef=3:3:12

R2p=R2*coef;

Tel=(m1*P*U1^2*R2p)./s./(omega.*((R1+R2p./s).^2.+(X1+X2)^2));

plot(s,Te1,`k-`);

str=strcat(`R2=`,num2str(R2p),`\Omega`);

str_y=Te1(length(Te1));

text(str_x,str_y,str,`Color`,`black`);

end