matlab Conversion to double from sym is not possible w=2000;theta=0:0.01:8*pi;vc=2.*cos(theta).*w-2.*cos(theta).*2.*w.*sin(theta)./5./sqrt(1-0.16.*(cos(theta)).^2);ac=-1600.*cos(2.*x)./(1-0.16.*(cos(x)).^2).^0.5-4000.*sin(x)+128.*cos(x).*sin(x).*sin(

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matlab Conversion to double from sym is not possible w=2000;theta=0:0.01:8*pi;vc=2.*cos(theta).*w-2.*cos(theta).*2.*w.*sin(theta)./5./sqrt(1-0.16.*(cos(theta)).^2);ac=-1600.*cos(2.*x)./(1-0.16.*(cos(x)).^2).^0.5-4000.*sin(x)+128.*cos(x).*sin(x).*sin(

matlab Conversion to double from sym is not possible w=2000;theta=0:0.01:8*pi;vc=2.*cos(theta).*w-2.*cos(theta).*2.*w.*sin(theta)./5./sqrt(1-0.16.*(cos(theta)).^2);ac=-1600.*cos(2.*x)./(1-0.16.*(cos(x)).^2).^0.5-4000.*sin(x)+128.*cos(x).*sin(x).*sin(
matlab Conversion to double from sym is not possible
w=2000;
theta=0:0.01:8*pi;
vc=2.*cos(theta).*w-2.*cos(theta).*2.*w.*sin(theta)./5./sqrt(1-0.16.*(cos(theta)).^2);
ac=-1600.*cos(2.*x)./(1-0.16.*(cos(x)).^2).^0.5-4000.*sin(x)+128.*cos(x).*sin(x).*sin(2.*x)./(1-0.16.*(cos(x)).^2).^1.5;
plot(theta,ac)

matlab Conversion to double from sym is not possible w=2000;theta=0:0.01:8*pi;vc=2.*cos(theta).*w-2.*cos(theta).*2.*w.*sin(theta)./5./sqrt(1-0.16.*(cos(theta)).^2);ac=-1600.*cos(2.*x)./(1-0.16.*(cos(x)).^2).^0.5-4000.*sin(x)+128.*cos(x).*sin(x).*sin(
ac中变量x没有被定义；
在第三句后面换行加上： syms x；
最后一句polt（theta,ac）
改为ezplot（theta,ac）就可以了

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