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Topic: Subscripted assignment dimension mismatch.
Replies: 1   Last Post: Oct 28, 2013 10:52 AM

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Curious

Posts: 1,976
Registered: 12/6/04
Re: Subscripted assignment dimension mismatch.
Posted: Oct 28, 2013 10:52 AM
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Siti Harwani <siti.harwani@gmail.com> wrote in message <667c1490-12c7-4e76-88a8-be6e5354b5bb@googlegroups.com>...
> Hi all,
>
> I have the following program, but with this error [Subscripted assignment dimension mismatch.
>
> Error in test_vlf_spherical (line 62)
> ep(i,j)=ga(i,j)*ep(i,j)+gb(i,j)*((1./r(i)./dr)*(rph*hr(i,j)-rmh*hr(i-1,j))...]
>
> i am trying to solve the problem by using (./) but i didnt work. can anyone help me to detect the problem? thank you
>
> ***********************
> close all
> clear all
>
> k=200;
> T=500;
>
> c=3*10^8;
> f=3*10^9;
> lamda = c/f;
> omega = 2*pi*f;
>
> %ddx = lamda/20;
> rr = 201;
> dr = 0.05*lamda;
> dt = dr/(2*c);
> r = 0:dr:dr*(rr-1);
>
> u0=4*pi*1e-7;
> eps = 1/(4*pi*9*10^9);
> sigma = 0;
>
> t0 = 40;
>
> %initialization
> ep = zeros(k+1,k+1);
> ht = zeros(k+1,k);
> hr = zeros(k,k+1);
>
> %ionospheric profile for earth-ionosphere waveguide as coefficients
> omegap = 1;
> epsr = 1;
> sigmar = 1;
>
> %property coefficient
> for i=1:k
> for j=1:k;
> ga(i,j)=exp(-(sigmar*dt)/(eps*epsr));
> gb(i,j)=(1./sigmar)*(1-exp(-(sigmar*dt)/(eps*epsr)));
> end;
> end;
>
>
> %define theta
> dth(2) = pi/180;
>
> % update equations
> for t=1:T
> % source
> %pulse=exp((-0.5)*( (t0-t)/spread ).^2);
> pulse=sin(2*pi*f*t*dt);
> ep(1,:)=pulse;
>
>
> % update Ez field
> for i=2:k
> for j=2:k
> rph = r(k)+dr/2;
> rmh = r(k)-dr/2;
> ep(i,j)=ga(i,j)*ep(i,j)+gb(i,j)*((1./r(i)./dr)*(rph*hr(i,j)-rmh*hr(i-1,j))...
> -(1./r(i)./dth)*(ht(i,j)+ht(i,j-1)));
> end
> end
> %
> for j=1:k+1
> ep(1,j)=0;
> ep(i+1,j)=0;
> end
> for i=1:k+1
> ep(i,1)=0;
> ep(i,k+1)=0;
> end
> %
>
> %update Ht (theta) field =Hx
> for i=1:k+1
> for j=1:k
> rph = r(i)+dr/2;
> rmh = r(i)-dr/2;
> ht(i,j) = ht(i,j)+(dt/u0/r(i)/dr)*(rph*ep(i,j)-rmh*ep(i,j+1));
> end
> end
>
> % update Hr field =Hy
> for i=1:k
> for j=1:k+1
> hr(i,j) = hr(i,j)+(dt/u0/r(i)/dth/sin(dth))*(sin(dth(i+1))*ep(i+1,j)...
> -sin(dth)*ep(i,j));
> end
> end
>
> % plot
> mesh(ep)
> tm=['T=',num2str(t)]
> text(10,100,0.5,tm)
> axis([1 101 1 101 -1 1]);
> drawnow;
>
> end
>
> **************************************


% Just a quick glance, but it looks like:
% dth is a vector (of at least 2) from:
> %define theta
> dth(2) = pi/180;


% so the result of the calculation:
ga(i,j)*ep(i,j)+gb(i,j)*((1./r(i)./dr)*(rph*hr(i,j)-rmh*hr(i-1,j))...
-(1./r(i)./dth)*(ht(i,j)+ht(i,j-1)));

% is a vector and you are trying to put that into a scalar - ep(i,j)



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