Warning: Explicit integral could not be found. 求高手解答int()定积分

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/07/03 11:29:54

Warning: Explicit integral could not be found. 求高手解答int()定积分问题
syms Dd Dd0 x y z Wn theta Ue Ve n s p q
Dd0=10^(-3);
Wn=((2*n+1).*pi.*x.*Dd0)/(3.6);
Dd=Dd0.*tanh(1.76.*sqrt((1/x)-1));
Ue=sqrt((1+sqrt(1+(Dd^2.*(sin(2.*theta)).^2)./(Wn.^2)))/2);
Ve=sqrt((1-sqrt(1+(Dd^2.*(sin(2.*theta)).^2)./(Wn.^2)))/2);
p=(Dd^2.*(sin(2.*theta)).^2.*exp(-2.*Wn.*cos(theta).*0.1));
q=sqrt(Wn.^2+Dd.^2.*(sin(2.*theta)).^2).*(Ue.^4+Ve.^4.*exp(-4.*Wn.*cos(theta).*0.1));
z=p./q;
s=int(z,theta,-pi/2,pi/2);
Warning: Explicit integral could not be found.

就是matlab 没法求出你这个式子的公式解,估计你只能算数值的了（theta没有赋值,应该没看错吧）
再问：可是我要求出来关于x的表达式，然后画图的，数值可以吗
再答：数值可以画图啊，不难，只是不想费力气看你的那个式子，你自己琢磨下吧。 matlab没有万能到世界上所有的积分都能积出来的。。再说，本来就存在很多不可能积出公式解的式子啊，无穷多的式子吧。

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