在运行一下程序是会出现Error: Missing variable or function.是怎么回事啊？
display('Please input the value of m(傅立叶级数展开的项数)')；
m=input('m=');
t=-2*pi:0.01:2*pi;
n=round(length(t)/4);
f=[ones(n,1);-1*ones(n,1);ones(n,1);-1*ones(n+1,1)];
y=zeros(m+1,mas(size(t)));
y(m+1,
=f';
figure(1);
plot(t/pi,y(m+1,
);
grid;
axis([-2 2 -1.5 1.5]);
title('周期方波')；
xlable('单位': pi','Fontsize',8);
x=zeros(size(t));
kk='1';
for k=1:2:2*m-1
pause;
x=x+sin(k*t)/k;
y((k+1)/2,
=4/pi*x;
plot(t/pi,y(m+1,
);
hold on;
plot(t/pi,y((k+1)/2,
);
hold off;
grid;
axis([-2 2 -1.5 1.5]);
title(strcat（'第',kk,'次谐波叠加'）);
xlabel('单位': pi','Fontsize',8);
kk=strcat(kk,'、',num2str(k+2));
end
pause;
plot(t/pi,y(1:m+1,
);
grid;
axis([-2 2 -1.5 1.5]);
title('各次谐波叠加波形');
xlabel('单位: pi','Fontsize',8);