MATLAB: Subscripted assignment dimension mismatch.

error

hi here is the function (1st one) that I have to calculate and plot http://i48.tinypic.com/axoarn.jpg , I changed my code like this and now I got this error Subscripted assignment dimension mismatch.
Error in ==> Untitled at 55 bes_kur_der(n,mg)=C;
How can I fix that? if true
clear all,
format long
tic
N_cut=20;
eps0=(10^-9)/(36*pi);
mu0=4*pi*10^-7;
epsr1=1.;
epsr2=2.;
mur1=1.;
mur2=1.;
eps1=epsr1*eps0;
eps2=epsr2*eps0;
mu1=mur1*mu0;
mu2=mur2*mu0;
freq=6*10^8;
omeg=2*pi*freq;
k=omeg*sqrt(eps1*mu1);
lambda=2*pi/k;
      Mr=21;
      Mtheta=21;
      Mphi=21;
      thetabegin=0.;
      thetaend=2*pi;
      deltatheta=(thetaend-thetabegin)/Mtheta;
      phibegin=0.;
      phiend=pi;
      deltaphi=(phiend-phibegin)/Mphi;
      Rbegin=0.;
      Rend=0.4;
      deltaR=(Rend-Rbegin)/Mr;
      R=Rbegin:deltaR:Rend;
      theta=thetabegin:deltatheta:thetaend;
      phi=phibegin:deltaphi:phiend;
 for mg=1:22
          R(mg)=R(mg);
          theta(mg)=theta(mg);
          phi(mg)=phi(mg);
      end
      for mg=1:22
          for n=1:N_cut
          A=sqrt(pi.*k.*R(mg)./2).*besselh(n+0.5,2,k.*R(mg));
          A(isnan(A))=0;
          bes_kur(n,mg)=A;
          B=sqrt(pi.*k.*R(mg)./2).*besselh(n+0.5,2,k.*R(mg));
          B(isnan(B))=0;
          han_kur(n,mg)=B;
          C=-n.*sqrt(pi.*k./(2.*R(mg))).*besselj(n+0.5,k.*R)+k.*sqrt(pi.*k.*R(mg)./2).*besselj(n-0.5,k.*R(mg));
          C(isnan(C))=0;
          bes_kur_der(n,mg)=C;
          D=-n.*sqrt(pi.*k./(2.*R(mg))).*besselh(n+0.5,2,k.*R(mg))+k.*sqrt(pi.*k.*R(mg)/2).*besselh(n-0.5,2,k.*R(mg));
          D(isnan(D))=0;
          han_kur_der(n,mg)=D; 
          a(n)=(1i.^n).*(2.*n+1);
          b(n)=(-((1i.^n).*(2.*n+1).*bes_kur_der(n,mg)))./han_kur_der(n,mg);
          c(n)=-((1i.^n).*(2.*n+1).*bes_kur(n,mg))./han_kur(n,mg);
          end
      end
       for mg=1:22
          for  n=1:N_cut
        L1=legendre(n,cos(theta(mg)));
        L11=legendre(n-1,cos(theta(mg)));
        L0(n,mg)=L1(1,:);
        L2(n,mg)=L1(2,:);
        if n==1
        L3(n,mg)=0.;
        else
        L3(n,mg)=L11(2,:);
        end
        %L2_der(n,mg)=n*(cos(thetag(mg))*L2(n,mg)-L0(n,mg))/sin(thetag(mg));
       % L2_der(n,mg)=-(n+1)*(cos(thetag(mg))*L2(n,mg)-L0(n,mg));
        L2_der(n,mg)=(-(n+1)*L3(n,mg)+n*cos(theta(mg))*L2(n,mg))/sin(theta(mg));
        E_theta(n,mg)=(1i/k*R(mg))*exp(-1i*k*R(mg)*cos(phi(mg))*(1i^n).*((b(n,R(mg)).*sin(theta(mg))).*L2_der(n,mg)).*(c(n,R(mg)).*L3(n,mg)./sin(theta(mg))));
          end
       end
     F_Etheta=sum(E_theta,2);
figure
plot(R,abs(E_theta))
    % code
  end

Best Answer

In the line
C=-n.*sqrt(pi.*k./(2.*R(mg))).*besselj(n+0.5,k.*R)+k.*sqrt(pi.*k.*R(mg)./2).*besselj(n-0.5,k.*R(mg));
use R(mg) as in:
C=-n.*sqrt(pi.*k./(2.*R(mg))).*besselj(n+0.5,k.*R(mg))+k.*sqrt(pi.*k.*R(mg)./2).*besselj(n-0.5,k.*R(mg));
Also, there is a line where you defined b(n,R(mg))at E_theta(n,mg) (the end of the code). This needs rechecking because b has one dimension.
At the beginning of the lops, you have the following unnecessary lines, delete them to fasten the run.
for mg=1:22
         R(mg)=R(mg);
         theta(mg)=theta(mg);
         phi(mg)=phi(mg);
 end
Related Question