# how I can fix the error "size inputs must be scalar".?

104 views (last 30 days)
Deepak d on 28 Feb 2018
Commented: Rik on 27 Sep 2022
clear all;
warning off;
epsa=8.9;
epsb=1;
a=1.0;
R=0.2*a;
i=sqrt(-1);
f=pi*R^2/a^2;
NumberofCell=1;
a1=a;
a2=a*i;
b1=2*pi/a/NumberofCell;
b2=2*pi/a/NumberofCell*i;
n=4;
display('fourier transform-----');
tic;
NumberofPW=(2*n+1)^2;
mind=(-2*n:2*n)'+2*n+1;
%aaaa=ones(1,size(mind))
%aaa=mind(:,ones(1,size(mind)));
mind=mind(:,ones(1,size(mind)))-2*n-1;
GG=mind'*b1+mind*b2;
eps21=2*f*(epsa-epsb)*besselj(1,abs(GG).*R)./(abs(GG).*R);
eps21(2*n+1,2*n+1)=epsb+f*(epsa-epsb);
zz=[-2 -2;-2 -1;-2 0;-2 1;-2 2;...
-1 -2;-1 -1;-1 0;-1 1;-1 2;
0 -2;0 -1; 0 1;0,2;
1 -2;1 -1;1 0;1 1;1 2;
2,-2;2,-1;2 0;2,1;2,2]*[a1 a2].';
eps20=zeros(length(eps21));
for x=1:length(zz)
eps20=eps20+exp(i*(real(GG).*real(zz(x))+imag(GG).*imag(zz(x)) )).*eps21;
end
ff=pi*R.^2*length(zz)/(NumberofCell^2*a^2);
eps20=eps20./NumberofCell^2;
eps20(2*n+1,2*n+1)=epsb+ff*(epsa-epsb);
count=1;
for y=-n:n;
for x=-n:n;
G(count)=x*b1+y*b2;
r(count,:)=[x,y];
count=count+1;
end
end
display('building ');
for x=1:NumberofPW;
for y=x:NumberofPW;
b=r(x,:)-r(y,:)+2*n+1;
eps2(x,y)=eps20(b(2),b(1));
eps2(y,x)=eps2(x,y);
end
end
k1=2*pi/a*0.5.*(0:0.1:1);
k2=2*pi/a*(0.5+(0.1:0.1:1).*0.5*i);
k3=2*pi/a*(0.5+0.5*i).*(0.9:-0.1:0);
k0=[k1 k2 k3];
display('now calculate the eigen value');
eps2=inv(eps(2));
if max(max(real(eps2)))>10^7*max(max(imag(eps2)))
display('symmetric');
esp2=real(eps2);
else
display('imag part is not zero');
stop;
end
option.disp=0;
counter=1;
for ii=1:length(k0);
k=k0(ii);
M=(real(k+G.')*real(k+G)+imag(k+G.')*imag(k+G)).*eps2;
E=sort(abs(eig(M)));
freq(:,counter)=sqrt(abs(E(1:10))).*a./2./pi;
display(sprintf('calculation of k=%f+%f*i is defined',real(k),imag(k)));
counter=counter+1;
end
toc;
[max(freq(1,:)),min(freq(2,:))]
tmpx=1:length(k0);
plot(tmpx,freq,'o-','linewidth',2)
grid on;
axis([1 31 0 1]);
Rik on 27 Sep 2022
What you posted was not an answer to this question, so I moved it to be a comment. Please do not hijack an unrelated thread.

Rik on 28 Feb 2018
The readability of your question is very poor. You can improve it a lot by selecting your code (when in edit mode), and pushing the {}Code button.
The problem is with ones(1,size(mind)). You cannot mix multiple inputs with vector input, so you should concatenate the two:
ones([1,size(mind)])
There might be many more bugs, but I can't read your code well enough to actually check if I see any.
Deepak d on 1 Mar 2018
Thanks a lot, the program is now running properly.

### Categories

Find more on Matrix Indexing in Help Center and File Exchange

### Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by