How can i solve the error Undefined function 'cxroot' for input arguments of type 'char'.?

Question

Deepak d 2018-5-30

0
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https://ww2.mathworks.cn/matlabcentral/answers/403239-how-can-i-solve-the-error-undefined-function-cxroot-for-input-arguments-of-type-char

回答： Walter Roberson 2018-5-30

i =1;
for a = 1.5 : 0.001 : 1.6
lambda11=a.*10^-6;
C=3e8 ;
Epsilond =3.61 ;
W=2*pi*C./lambda11;
K0=2*pi./lambda11;
WP=1.3605e16 ;
gamma=(1.7352e13 );
A=W.^2+1i*gamma*W
Epsilonm=1-((WP*WP)/A);
h=((Epsilonm*Epsilond)/(Epsilonm+Epsilond));
beta=K0*sqrt(h);
neff=beta/K0 ;
lambda1(i)=lambda11 ;
neff1(i)=real(neff);
i =i+1;
end
global lambda ;
Nmax=50;
tol =5.1*10^6 ;
h=1.88;
i =1;
for a=1.5:0.01:1.6
lambda=a.*10^-6;
x1=cxroot('project',h);
y=x1;
y1(i)=real(x1);
y2(i)=imag(x1);
lambda12(i)=lambda;
i=i+1;
end
plot(lambda1,neff1,lambda12, y1)