求助MATLAB画图问题

TDF

syms x a u k l m b;
A=[-x^2*a^2+1+a^2*u,2*k*x*a+2*u*l*x*a^2,-u*a^2,-2*u*l*a^2*x;-k*2*x*a-2*l*u*x*a^2,x^2*a^2+1+u*a^2,2*l*u*x*a^2,-u*a^2;-4*a^2,-8*l*a^2*x,-4*x^2*a^2+4*a^2-m*x^2*a^2*4.38/3.14,8*l*a^2*x-m*x^2*a^2*(-1.854)/3.14;8*k*a^2*x,-4*a^2,-8*l*a^2*x-m*x^2*a^2*(-1.854)/3.14,-4*x^2*a^2+4*a^2-m*x^2*a^2*3.62/3.14];
a=3;u=0.7;k=0.06;l=0.07;m=0.2;b=0.0007;
B=subs(A);
G=[0 ;b;m*a^2*x^2*-0.0044/3.14; m*a^2*x^2*0.004/3.14 ];
F=subs(G);
H=B\F ;
P1=H(1);Q1=H(2);P2=H(3);Q2=H(4);
Y1=sqrt(P1^2+Q1^2)/0.0007;
Y2=sqrt(P2^2+Q2^2)/0.0007;
x=1:100；
plot(x,Y1)
??? Error using ==> plot
Conversion to double from sym is not possible.
请问各位大侠，这个问题如何才能解决呢？谢谢啦

TDF

怎么没人回答啊

shizijun

符号函数画图ezplot(Y1)