matlab求非线性方程

[wht719459261]

matlab求非线性方程y1和y2的交点，未知数是nx
n1=0.81;
Pg=6.5;
Qtg=260;
Pz=10;
Qtz=75;
Pc=1.2;
Qtc=110;
neh=2000;
Memax=400;
ne=1600;
D=0.29;
Mg1=(10.^3)*0.5*Qtg/(2*pi*neh*n1);
Mz1=(10.^3)*0.5*Qtz/(2*pi*neh*n1);
Mg =(10.^3)*Pg*Qtg/(2*pi*neh*n1);
Mz =(10.^3)*Pz*Qtz/(2*pi*neh*n1);
Mc =(10.^3)*Pc*Qtc/(2*pi*neh*n1);
Meh=(9550*7.35)/neh;
YY=[31.6 32.3 33.4 35.1 36.2 37.2 37.5 39.0 39.4...
40.9 40.1 37.1 34.0 33.6 29.5 24.1 17.5 9.6 ]/1000;
f=20;
tt=0;
for i=1:1:18;
for nx=1000:1:neh;
tt=max(tt)+nx/18;
y11=Memax-((Memax-Meh)*((ne-nx).^2))/((neh-ne).^2)-Mg-Mz1-Mc;
y22=YY(i)*(nx.^2)*(D.^5);
x=1000:1:neh;
a=find(abs(y11-y22)==min(abs(y11-y22)));
y1=Memax-((Memax-Meh)*((ne-x).^2))/((neh-ne).^2)-Mg-Mz1-Mc;
y2=YY(i)*(x.^2)*(D.^5);
我想得到y11等于y22时的nx的值，有什么办法吗