[求助]求牛人帮我改一下2D-TM的MATLAB程序

想问一下哪些参数要改，我的递推有没有问题，PML的设置有没有问题，还有画的图总是不对，如果输出的场为数值的话不是0就是NAN，谁能帮我改一下呢，谢啦O(∩_∩)O~ )
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% u<Kowt<ci  
%      fundamental constants (in the dimesion of m) $Lr&V~  
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% ' @RF  
cc=2.99792458e8;            %speed of light in free space @"@|O>KJ  
muz=4.0*pi*1.0e-7;          %permeability of free space E ?Mgbd3  
epsz=1.0/(cc*cc*muz);       %permittivity of free space rXi&8R[  
lambda=1.55e-6;             %center wavelength of source excitation 1EXT^2!D  
freq=cc/lambda;                %center frequency of source excitation F(yR\)!C  
omega=2.0*pi*freq;          '9zW#b  
%*********************************************************************** .;]WcC<3  
%     Grid parameters (in the dimesion of m) M bWby'  
%*********************************************************************** UDh\%?j  
ie=320;           %number of grid cells in x-direction k1<^Ept  
je=44;            %number of grid cells in y-direction V 9Qt;]mQ  
ib=ie+1; oFj_o  
jb=je+1; 6u0>3-[6OD  
is=5;            %location of x-directed hard source KClkPL!jP  
js=je/2;          %location of x-directed hard source [(heE  
dx=5.0e-9;        %space increment of square lattice \ZZ6r^99  
dt=lambda/(pi*cc);   %time step o]q~sJVk6  
nmax=3300;         %total number of time steps ~t)cbF(UO  
iebc=8;           %thickness of left and right PML region Jh3  
jebc=8;           %thickness of front and back PML region He(65ciT<O  
ibbc=iebc+1; cuN9RG  
jbbc=jebc+1; zr/v.$<  
iefbc=ie+2*iebc; )2Ei<  
jefbc=je+2*jebc; 9j:]<?D,A  
ibfbc=iefbc+1; Vr EGR$  
jbfbc=jefbc+1; Hz.i$L0}  
%*********************************************************************** Z)s !p  
%     Material parameters =&z+7Pe[  
%*********************************************************************** 2iG+Ek-?"  
media=2; 
-G.N  
omegap=1.34639e16; MY,~leP&  
epsm1=1.999+omegap^2/((9.61712e-13i)*omega-omega^2); bzFac5n)Q  
epsm=real(epsm1); J<0{3pZY  
eps=[1.0 epsm ]; <D/K[mz-  
sig=[0.0 8.85e-18]; A|\A|8=b  
mur=[1.0 4.0*pi*1.0e-7]; ,`}yJ*7  
sim=[0.0 0.0]; w7Yu} JY^  
%*********************************************************************** "E\vdhk  
%     Wave excitation LDr?'M!D  
%*********************************************************************** ]q1w@)]n}  
rtau=10*lambda/pi/cc; Uj7Y
TB  
tau=rtau/dt; Voo'ZeZa  
delay=3*tau; nQ\`]_C  
source=zeros(1,nmax);
CPJ21^  
for n=1:7.0*tau I=kqkuW  
  source(n)=sin(omega*(n-delay)*dt)*exp(-((n-delay)^2/tau^2)); 5@2Rl>B$  
end Sb[>R(0:  
subplot(2,1,1) 8"j$=T6;W  
plot(source) +MX~1RU+  
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% !T,<p   
%                fields
::>|[ND  
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% .dU91> ~Ov  
ez=zeros(ib,jb); pG#tMec  
hx=zeros(ib,je);            %fields in main grid |M;Nq@bRv  
hy=zeros(ie,jb); h9QM nH'  
ezbcf=zeros(ibfbc,jebc); p< 7rF_?W0  
ezxbcf=zeros(ibfbc,jebc); G}8tFo.d1  
ezybcf=zeros(ibfbc,jebc); klUV&O+=%  
hxbcf=zeros(ibfbc,jebc);       %fields in front region !-lI<$S:  
hybcf=zeros(iefbc,jebc); FOQ-KP\=,  
ezbcb=zeros(ibfbc,jebc); )/jDt dI  
ezxbcb=zeros(ibfbc,jebc);   pTCD1)  
ezybcb=zeros(ibfbc,jebc); R!M'  
hxbcb=zeros(ibfbc,jebc);       %fields in back region r
WTaCU^qV  
hybcb=zeros(iefbc,jebc); nK;d\DO  
ezbcl=zeros(iebc,jb); |Q/LC0?  
ezxbcl=zeros(iebc,jb); ni/s/^  
ezybcl=zeros(iebc,jb); CtCReH03  
hxbcl=zeros(iebc,je);        %fields in left region 7Mh'x:p  
hybcl=zeros(iebc,jb); 3+Lwtb}XPF  
ezbcr=zeros(iebc,jb); ~^2w)-N  
ezxbcr=zeros(iebc,jb); ?{ )'O+s  
ezybcr=zeros(iebc,jb); cg8/v:B  
hxbcr=zeros(iebc,je);        %fields in right region th{f|fm62  
hybcr=zeros(iebc,jb); k*C69  
%************************************************************************ uOv<*Jld*  
%ezxbcfn(1:ibfbc,1:jebc)=ezxbcf(1:ibfbc,1:jebc); N|yA]dg[  
%ezybcfn(1:ibfbc,1:jebc)=ezybcf(1:ibfbc,1:jebc); l ms^|?  
%hxbcfn(1:ibfbc,1:jebc)=hxbcf(1:ibfbc,1:jebc);       %fields in front region****************************************************************************************** lwQ!sH[M  
%hybcfn(1:iefbc,1:jebc)=hybcf(1:iefbc,1:jebc); Fqeqn[,  
8xLQ" l+"  
%ezxbcbn(1:ibfbc,1:jebc)=ezxbcb(1:ibfbc,1:jebc); NCKR<!(  
%ezybcbn(1:ibfbc,1:jebc)=ezybcb(1:ibfbc,1:jebc); T \/^4N`  
%hxbcbn(1:ibfbc,1:jebc)=hxbcb(1:ibfbc,1:jebc);       %fields in back region******************************************************************************************** |KhpF1/(  
%hybcbn(1:iefbc,1:jebc)=hybcb(1:iefbc,1:jebc); ".>#Qp%  


rN&fFI  
%ezxbcln(1:iebc,1:jb)=ezxbcl(1:iebc,1:jb); N/o?\q8  
%ezybcln(1:iebc,1:jb)=ezybcl(1:iebc,1:jb); }!iopu  
%hxbcln(1:iebc,1:je)=hxbcl(1:iebc,1:je);        %fields in left region L ci?  
%hybcln(1:iebc,1:jb)=hybcl(1:iebc,1:jb); }ppApJT  
+ywz@0nx  
%ezxbcrn(1:iebc,1:jb)=ezxbcr(1:iebc,1:jb); ;5/Se"Nd  
%ezybcrn(1:iebc,1:jb)=ezybcr(1:iebc,1:jb); T
B>_#+:  
%hxbcrn(1:iebc,1:je)=hxbcr(1:iebc,1:je);        %fields in right region ?Z{/0X)]|  
%hybcrn(1:iebc,1:jb)=hybcr(1:iebc,1:jb); 0XA\Ag\`G  
%*********************************************************************** @ym:@<D  
%     Updating coefficients c +]r  
%*********************************************************************** eQ'E`S_d  
t\/H.Hb  
for i=1;media jA,y.(mR  
  eaf  =dt*sig(i)./(2.0*epsz*eps(i)); &}u_e`A  
  ca(i)=(1.0-eaf)/(1.0+eaf); lf(+]k30  
  cb(i)=dt/epsz/eps(i)./dx/(1.0+eaf); x<l 5wh  
  haf  =dt*sim(i)./(2.0*muz*mur(i)); wo&IVy@s$  
  cp(i)=(1.0-haf)/(1.0+haf); (]q ([e  
  cq(i)=dt/muz/mur(i)./dx./(1.0+haf); K}cZK  
end 96\FJHtZ  
%for i=2 U<=TAWZ@  
  %eaf  =dt*sig(i)./(2.0*epsz*eps(i)); :rr<#F  
  %ca2=(1.0-eaf)/(1.0+eaf); (')t>B1Z  
  %cb2=dt/epsz/eps(i)./dx/(1.0+eaf); I%4eX0QY=z  
  %haf  =dt*sim(i)./(2.0*muz*mur(i));%  ck;:84  
 % cp2=(1.0-haf)/(1.0+haf); %1{S{FB  
  %cq2=dt/muz/mur(i)./dx./(1.0+haf); q?j7bp]  
%end #X)DFAtb  
>J9Qr#=H2  
%*********************************************************************** s>DFAu!  
%     Geometry specification (main grid) 0")_%  
%*********************************************************************** U9]&KNx  
%     Initialize entire main grid to free space <2(X?,N5BD  
caez(1:ib,1:jb)=ca1; :7(fBf5  
cbez(1:ib,1:jb)=cb1; !\'w>y7  
cphx(1:ib,1:je)=cp1; vVBWhY]  
cqhx(1:ib,1:je)=cq1; Jj]<
SWh  
cphy(1:ie,1:jb)=cp1; t 9(,JC0  
cqhy(1:ie,1:jb)=cq1; >(2;(TbQm0  
% boundary of main zone Ue9d0#9  
sigmamax=1e-17;               %???????????????????????????????? A5R"|<UPR  
%for i=140:180 yFAUD ro  
    for j=3 2po8n_  
eaf  =dt*(sig(2)+sigmamax/64)/(2.0*epsz*eps(2));
w?D=  
  caez(140:180,j)=(1.0-eaf)/(1.0+eaf); Ge)G.>c  
  cbez(140:180,j)=dt/epsz/eps(2)/dx/(1.0+eaf); S8v,'Cc  
    end J)g +I  
%end ar@,SKU'K  
%for i=140:180 _oZ3n2v}@  
    for j=42 |~76dxU  
eaf  =dt*(sig(2)+sigmamax/64)/(2.0*epsz*eps(2)); -d?<t}a  
  caez(140:180,j)=(1.0-eaf)/(1.0+eaf); htYfIy{5w  
  cbez(140:180,j)=dt/epsz/eps(2)/dx/(1.0+eaf); m<n+1  
    end w
%wVB/(  
%end
_&HFKpHQ  
for i=140 !v3d:n\W8  
    %for j=3:42 bSTori5  
eaf  =dt*(sig(2)+sigmamax/64)/(2.0*epsz*eps(2)); 67/@J)z0%  
  caez(i,3:42)=(1.0-eaf)/(1.0+eaf); .\`MoH  
  cbez(i,3:42)=dt/epsz/eps(2)/dx/(1.0+eaf); =&g:dX|q8  
    %end c:=HN-*vQ  
end &kf \[|y  
for i=180 |+h x2?Nv  
   % for j=3:42 6Lq8#{/]u  
eaf  =dt*(sig(2)+sigmamax/64)/(2.0*epsz*eps(2)); ZW))Mx#K=T  
  caez(i,3:42)=(1.0-eaf)/(1.0+eaf); k'X"jon  
  cbez(i,3:42)=dt/epsz/eps(2)/dx/(1.0+eaf); G$)q% b;Lz  
    %end <YCjo[(~  
end \ $TM=Ykj  
%     add SMG &x (D%+  
for i=141:179 ,M]W_\N~E  
    for j=4:41 #F/W_G7v  
        caez(i,j)=ca2; #pW
y%U  
        cbez(i,j)=cb2; l )r^|9{  
        cphx(i,j)=cp2; qW3XA$g|j'  
        cqhx(i,j)=cq2; +v%+E{F$+  
        cphy(i,j)=cp2; "vYjL&4h  
        cqhy(i,j)=cq2; h9d*N9!;M  
    end \HD:#a  
end &xr(Kb  
Zc";R!At  
%     Fill the PML regions ]@_|A, ]  
caezxbcf=zeros(ibfbc,jebc); {%2p(5FB  
cbezxbcf=zeros(ibfbc,jebc);  2X`t&zg  
caezybcf=zeros(ibfbc,jebc); `m V(
:  
cbezybcf=zeros(ibfbc,jebc); rXSw@pqZ&  
cphxbcf=zeros(ibfbc,jebc);       %fields in front region hB'rkjt  
cqhxbcf=zeros(ibfbc,jebc); oVl:g:K40  
cphybcf=zeros(iefbc,jebc); &gh>'z;`r  
cqhybcf=zeros(iefbc,jebc); f3;[ZS  
caezxbcb=zeros(ibfbc,jebc); ^!m%:r7Dr  
cbezxbcb=zeros(ibfbc,jebc); 5> 81Vhc,  
caezybcb=zeros(ibfbc,jebc); 2n"-~'3\  
cbezybcb=zeros(ibfbc,jebc); -4Q\FLC'k  
cphxbcb=zeros(ibfbc,jebc);       %fields in back region MHE/#G  
cqhxbcb=zeros(ibfbc,jebc); B8wGWZ@  
cphybcb=zeros(iefbc,jebc); pw))9~XU  
cqhybcb=zeros(iefbc,jebc); a{e1g93}  
caezxbcl=zeros(iebc,jb); 4{,!'NA  
cbezxbcl=zeros(iebc,jb); S!-t{Q+j^  
caezybcl=zeros(iebc,jb); ndyIsR  
cbezybcl=zeros(iebc,jb); 87pu\(,'  
cphxbcl=zeros(iebc,je);        %fields in left region "
SuG6!k3  
cqhxbcl=zeros(iebc,je); 
4[Ko|  
cphybcl=zeros(iebc,jb); r{*Qsaw  
cqhybcl=zeros(iebc,jb); {#=o4~u%;H  
4tkb7D q  
caezxbcr=zeros(iebc,jb); (Rs;+S  
cbezxbcr=zeros(iebc,jb); lNe5{'OrO  
caezybcr=zeros(iebc,jb); )REegFN@  
cbezybcr=zeros(iebc,jb); c*w0Jz>@.7  
cphxbcr=zeros(iebc,je);        %fields in right region \1u^?cBd  
cqhxbcr=zeros(iebc,je); $U&p&pgH=W  
cphybcr=zeros(iebc,jb); s4Jy96<
 
cqhybcr=zeros(iebc,jb); ~Y1nU-  
%a=ones(iebc,je); U+-;(Fh~  
%*********************************************************************** ;<MHl[jJD  
%     Fill the PML regions a U<+ `  
%*********************************************************************** aEEb1Y  
rmax=0.00001; zl, Vj%d  
orderbc=2; '0Q/oU  
delbc=iebc*dx; sCf)#6mI  
sigmam=-log(rmax/100.0)*epsz*cc*(orderbc+1)/(2*delbc); !;t6\Z8&  
bcfactor=eps(1)*sigmam/(dx*(delbc^orderbc)*(orderbc+1)); h1Y^+A_  
rmax=0.00001; A'uubFRL2[  
orderbc=2; aYtW!+#  
%     FRONT region O*F= xG  
caexbcf(1:iefbc,1)=1.0; p=[I;U-#H  
cbexbcf(1:iefbc,1)=0.0; B<|Vm.D  
for j=2:jebc 8XCT[X  
  y1=(jebc-j+1.5)*dx; 2L.6!THG  
  y2=(jebc-j+0.5)*dx; N5MWMN[6aP  
  sigmay=bcfactor*(y1^(orderbc+1)-y2^(orderbc+1)); RdjoVCf  
  ca1=exp(-sigmay*dt/(epsz*eps(1))); =OrVaZ0  
  cb1=(1.0-ca1)/(sigmay*dx); cI6Td*vM  
  caexbcf(1:iefbc,j)=ca1; Nbf>Y  
  cbexbcf(1:iefbc,j)=cb1; 3
#uc+$[  
end }_}LaEYAo  
sigmay = bcfactor*(0.5*dx)^(orderbc+1); dF&@q,  
ca1=exp(-sigmay*dt/(epsz*eps(1))); d_[zt)  
cb1=(1-ca1)/(sigmay*dx); eOb)uIF  
caex(1:ie,1)=ca1; 6 G,cc  
cbex(1:ie,1)=cb1; u3cl7~- yW  
caexbcl(1:iebc,1)=ca1; 16ip:/5  
cbexbcl(1:iebc,1)=cb1; qus%?B{b}  
caexbcr(1:iebc,1)=ca1; SJ,
];mC0  
cbexbcr(1:iebc,1)=cb1; '^Q$:P{G?  
for j=1:jebc ;+3@S`2r  
  y1=(jebc-j+1)*dx; aMK\&yZD  
  y2=(jebc-j)*dx; 
*I9O63  
  sigmay=bcfactor*(y1^(orderbc+1)-y2^(orderbc+1)); f]Zj"Tt-  
  sigmays=sigmay*(muz/(epsz*eps(1))); +wEsfYW  
  cp1=exp(-sigmays*dt/muz); X=jD^"-  
  cq1=(1-cp1)/(sigmays*dx); nGDY::nUE  
 cphzybcf(1:iefbc,j)=cp1; 1#zD7
b~  
  cqhzybcf(1:iefbc,j)=cq1; ND3|wQ`M0  
  caeybcf(1:ibfbc,j)=ca(1); Z0 c|;  
  cbeybcf(1:ibfbc,j)=cb(1); bdBLfWe  
  cphzxbcf(1:iefbc,j)=cp(1); _GoFwVO  
  cqhzxbcf(1:iefbc,j)=cq(1); Nah\4-75&  
end 8yswi[  
%     BACK region LCSJIt  
caexbcb(1:iefbc,jbbc)=1.0; QqC-ztz  
cbexbcb(1:iefbc,jbbc)=0.0; 7?y([i\y  
for j=2:jebc b-#oE{(\'  
  y1=(j-0.5)*dx; MbQ%'z6D  
  y2=(j-1.5)*dx; Tkj F/zv  
  sigmay=bcfactor*(y1^(orderbc+1)-y2^(orderbc+1)); /mn'9=ks  
  ca1=exp(-sigmay*dt/(epsz*eps(1))); p8iKZI]g  
  cb1=(1-ca1)/(sigmay*dx); )ItW}1[I  
  caexbcb(1:iefbc,j)=ca1; *y~~~ 'J/  
  cbexbcb(1:iefbc,j)=cb1; #8WHIDS>  
end LmKY$~5P  
sigmay = bcfactor*(0.5*dx)^(orderbc+1); H@|m^1  
ca1=exp(-sigmay*dt/(epsz*eps(1))); H:q;IYE+a  
cb1=(1-ca1)/(sigmay*dx); bz`rSp8h  
caex(1:ie,jb)=ca1; tt&{f <*  
cbex(1:ie,jb)=cb1; :c:}_t{%  
caexbcl(1:iebc,jb)=ca1; ]~pM;6Pu0  
cbexbcl(1:iebc,jb)=cb1; yx<-M  
caexbcr(1:iebc,jb)=ca1; %mS>v|  
cbexbcr(1:iebc,jb)=cb1; }'p*C
$  
for j=1:jebc 9 H>JS  
  y1=j*dx; .;dI&0Z  
  y2=(j-1)*dx; 0Fs2* FS  
  sigmay=bcfactor*(y1^(orderbc+1)-y2^(orderbc+1)); i66/2BUh.  
  sigmays=sigmay*(muz/(epsz*eps(1))); ( _MY;S  
  cp1=exp(-sigmays*dt/muz); GC
rsf  
  ccq1=(1-cp1)/(sigmays*dx); cVaGgP}\  
  cphzybcb(1:iefbc,j)=cp1; %YG[?"P'  
  cqhzybcb(1:iefbc,j)=cq1; u&j_;Y!6  
  caeybcb(1:ibfbc,j)=ca(1); 2\"T&  
  cbeybcb(1:ibfbc,j)=cb(1); _!yUr5&,Br  
  cphzxbcb(1:iefbc,j)=cp(1); [KEw5-=i@  
  cqhzxbcb(1:iefbc,j)=cq(1); S;u2B_/  
end :?gp}.  
%     LEFT region 0|mCk  
caeybcl(1,1:je)=1.0; 'qoaMJxN`  
cbeybcl(1,1:je)=0.0; )SaMfP1=v  
for i=2:iebc [mo9?  
  x1=(iebc-i+1.5)*dx; =>e> r~cW  
  x2=(iebc-i+0.5)*dx; ddlF4L_  
  sigmax=bcfactor*(x1^(orderbc+1)-x2^(orderbc+1)); Rz<'&Z>;  
  ca1=exp(-sigmax*dt/(epsz*eps(1))); Ibv`/8xh  
  cb1=(1-ca1)/(sigmax*dx); m-9ChF:U  
  caeybcl(i,1:je)=ca1; \5#eBJ  
  cbeybcl(i,1:je)=cb1; Vzh\1cF  
  caeybcf(i,1:jebc)=ca1; k7nke^,|  
  cbeybcf(i,1:jebc)=cb1; |-]'~@~  
  caeybcb(i,1:jebc)=ca1; o#-^Lg&
 
  cbeybcb(i,1:jebc)=cb1; DH])Q5  
end LO,:k+&A+  
sigmax=bcfactor*(0.5*dx)^(orderbc+1); >4?735f=x  
ca1=exp(-sigmax*dt/(epsz*eps(1))); dp }zG+  
cb1=(1-ca1)/(sigmax*dx); ^aqBL  
caey(1,1:je)=ca1; ;(Z9.  
cbey(1,1:je)=cb1; /9ZU_y4&3f  
caeybcf(iebc+1,1:jebc)=ca1; T9YrB  
cbeybcf(iebc+1,1:jebc)=cb1; Vo(bro4ZQi  
caeybcb(iebc+1,1:jebc)=ca1; DLoH.Fd  
cbeybcb(iebc+1,1:jebc)=cb1; *n9=Q9  
for i=1:iebc `Js"*[z  
  x1=(iebc-i+1)*dx; i@ehD@.dH  
  x2=(iebc-i)*dx; v
|rBOv  
  sigmax=bcfactor*(x1^(orderbc+1)-x2^(orderbc+1)); LKM;T-  
  sigmaxs=sigmax*(muz/(epsz*eps(1))); Y";KWA}b  
  cp1=exp(-sigmaxs*dt/muz); fHgvh&FU  
  cq1=(1-da1)/(sigmaxs*dx); CeUC[cUQU  
  cphzxbcl(i,1:je)=cp1; > q8)~  
  cqhzxbcl(i,1:je)=cq1; N1JM[<PP  
  cphzxbcf(i,1:jebc)=cp1; >%c>R'~h  
  cqhzxbcf(i,1:jebc)=cq1; wd2z=^S~  
  cphzxbcb(i,1:jebc)=cp1; vSo,,~F  
  cqhzxbcb(i,1:jebc)=cq1; 3oPyh $*  
  caexbcl(i,2:je)=ca(1); 1(WBvAPS  
  cbexbcl(i,2:je)=cb(1); ]&"01M~+K  
  cphzybcl(i,1:je)=cp(1); 'On%p|s)H  
  cqhzybcl(i,1:je)=cq(1); nCLEAe$W\=  
end N}'2GBqfU4  
    Aot9^@4])  
      m :2A[H+  
%*********************************************************************** p|w0 i[hc  
%     Movie initialization tf>"fU\P  
%*********************************************************************** 0>ce~KU  
subplot(2,1,2),pcolor(ez); B#o6UO\  
shading flat; N@I=X-7nh|  
caxis([-1000000000 1000000000]); z7HM/<W
Y  
axis([1 ib 1 jb]); [$`%ve  
%axis([1 jb 1 ib]); 8)YDUE%VH  
colorbar; 4mm>6w8NT  
axis image; $OaxetPH  
axis off; a6"-,Kg  
title(('ez at time step = 0')); eI/5foA  
|u#7@&N1  
%*********************************************************************** E_#?;l>  
%     BEGIN TIME-STEPPING LOOP j;EH[3  
%*********************************************************************** .i3_D??  
ezbcl(1:iebc,1:jb)=ezxbcl(1:iebc,1:jb)+ezybcl(1:iebc,1:jb); n"Wlfd0  
    ezbcr(1:iebc,1:jb)=ezxbcr(1:iebc,1:jb)+ezybcr(1:iebc,1:jb); HDj260a  
    ezbcf(1:ibfbc,1:jebc)=ezxbcf(1:ibfbc,1:jebc)+ezybcf(1:ibfbc,1:jebc); |+Tq[5&R  
    ezbcb(1:ibfbc,1:jebc)=ezxbcb(1:ibfbc,1:jebc)+ezybcb(1:ibfbc,1:jebc); Pk`3sfz  
    Am"&ApK  
for n=1:nmax UYhxgPGsj  
%*********************************************************************** PeJIa %iE  
%     Update electric fields (ez,hx,hy) in main grid  =tc!"{  
%*********************************************************************** WIw*//nw  
   2CV?cm  
    x=source(n).*10e20; q!YAA\'3
1  
  2k^'}7G%  
     ez(is,js)=ez(is,js)+x;%      5i=C?W`'  
    ez(2:ie,2:je)=caez(2:ie,2:je).*ez(2:ie,2:je)+... D/Py?<n-B  
        cbez(2:ie,2:je).*((hy(2:ie,2:je)-hy(1:ie-1,2:je))-... #l!nBY~  
        (hx(2:ie,2:je)-hx(2:ie,1:je-1))) `ix&j8E22w  
   kTm}VTr 1  
    hx(1:ie,1:je)=cphx(1:ie,1:je).*hx(1:ie,1:je)+... /1b7f'  
        cqhx(1:ie,1:je).*(ez(1:ie,2:jb)-ez(1:ie,1:je)); e. R9:  
    hy(1:ie,1:jb)=cphy(1:ie,1:jb).*hy(1:ie,1:jb)+... sY&Z/Y  
        cqhy(1:ie,1:jb).*(ez(2:ib,1:jb)-ez(1:ie,1:jb)); 1H8/bD  
   [=^Wj`;  
ezxbcfn(1:ibfbc,1:jebc)=ezxbcf(1:ibfbc,1:jebc); pL2{zW`FDh  
ezybcfn(1:ibfbc,1:jebc)=ezybcf(1:ibfbc,1:jebc); )h0b}HMW)  
%ezybcf(2:iefbc,2)=ezybcf(2:iefbc,2);       %fields in front region &W*^&0AV  
ezbcfn(1:ibfbc,1:jebc)=ezbcf(1:ibfbc,1:jebc); eaDG7+iS  
M[QQi2:&  
ezxbcbn(1:ibfbc,1:jebc)=ezxbcb(1:ibfbc,1:jebc); NJg )S2]7  
ezybcbn(1:ibfbc,1:jebc)=ezybcb(1:ibfbc,1:jebc); 
c-
ql  
%ezybcbn(2:iefbc,jebc-1)=ezybcb(2:iefbc,jebc-1);       %fields in back region YVPLHwh/5  
ezbcbn(1:ibfbc,1:jebc)=ezbcb(1:ibfbc,1:jebc); 8;x0U`}Ez(  
%ezbcln(iebc-1,1)=ezbcl(iebc-1,1); k\-h-0[|  
%ezbcln(2,jb)=ezbcln(2,jb); A5L
zd  
%ezbcf(ibbc,1)=ezbcbn(ibbc-1,2) A}(o1wuw  
ezxbcln(1:iebc,1:jb)=ezxbcl(1:iebc,1:jb); Dv~jVIXu  
ezybcln(1:iebc,1:jb)=ezybcl(1:iebc,1:jb);        %fields in left region H'&[kgnQ@  
ezbcln(1:iebc,1:jb)=ezbcl(1:iebc,1:jb); XmN8S_M>v  
%ezbcf(1,1)=ezbcfn(2,2) rbrh;\<jM  
ezxbcrn(1:iebc,1:jb)=ezxbcr(1:iebc,1:jb); ?$VkMu$2k  
ezybcrn(1:iebc,1:jb)=ezybcr(1:iebc,1:jb);       %fields in right region wJh/tb=$o  
ezbcrn(1:iebc,1:jb)=ezbcr(1:iebc,1:jb);
:a9  
    _7'5IA  
    % left P7$/yBI U  
    hxbcl(1:iebc,1:je)=cphxbcl(1:iebc,1:je).*hxbcl(1:iebc,1:je)+... sEi9<$~R@0  
        cqhxbcl(1:iebc,1:je).*(ezbcl(1:iebc,1:je)-ezbcl(1:iebc,2:jb)); ^95njE`>t`  
    hybcl(1:iebc-1,1:jb)=cphybcl(1:iebc-1,1:jb).*hybcl(1:iebc-1,1:jb)+... H^M>(kT#&  
        cqhybcl(1:iebc-1,1:jb).*(ezbcl(2:iebc,1:jb)-ezbcl(1:iebc-1,1:jb)); W"&,=wvg2  
    ezxbcl(2:iebc,1:jb)=caezxbcl(2:iebc,1:jb).*ezxbcl(2:iebc,1:jb)+... P+DIo7VTX  
        cbezxbcl(2:iebc,1:jb).*(hybcl(2:iebc,1:jb)-hybcl(1:iebc-1,1:jb)); 1o?uf,H7O  
    ezybcl(1:iebc,2:je)=caezybcl(1:iebc,2:je).*ezybcl(1:iebc,2:je)+... bbT$$b-  
        cbezybcl(1:iebc,2:je).*(hxbcl(1:iebc,2:je)-hxbcl(1:iebc,1:je-1)); (
QQkXlJ  
    % right I8uFMP  
    hxbcr(1:iebc,1:je)=cphxbcr(1:iebc,1:je).*hxbcr(1:iebc,1:je)+... /|isRh|  
        cqhxbcr(1:iebc,1:je).*(ezbcr(1:iebc,1:je)-ezbcr(1:iebc,2:jb)); e/}4Pt  
    hybcr(2:iebc,1:jb)=cphybcr(2:iebc,1:jb).*hybcr(2:iebc,1:jb)+... R$;TX^r'o&  
        cqhybcr(2:iebc,1:jb).*(ezbcr(2:iebc,1:jb)-ezbcr(1:iebc-1,1:jb)); $CZ'[`+  
    ezxbcr(1:iebc-1,1:jb)=caezxbcr(1:iebc-1,1:jb).*ezxbcr(1:iebc-1,1:jb)+... |mcc?*%t8  
        cbezxbcl(1:iebc-1,1:jb).*(hybcr(2:iebc,1:jb)-hybcr(1:iebc-1,1:jb)); #@F.wV0  
    ezybcr(1:iebc,2:je)=caezybcr(1:iebc,2:je).*ezybcr(1:iebc,2:je)+...      h=B= J  
        cbezybcl(1:iebc,2:je).*(hxbcr(1:iebc,2:je)-hxbcr(1:iebc,1:je-1)); PJ^qE|X  
    % down w^NQLV S  
    hxbcf(1:ibfbc,1:jebc-1)=cphxbcf(1:ibfbc,1:jebc-1).*hxbcf(1:ibfbc,1:jebc-1)+... ~EU\\;1Rmq  
        cqhxbcf(1:ibfbc,1:jebc-1).*(ezbcf(1:ibfbc,2:jebc)-ezbcf(1:ibfbc,1:jebc-1)); Z}.ZTEB  
    hybcf(1:iefbc,1:jebc)=cphybcf(1:iefbc,1:jebc).*hybcf(1:iefbc,1:jebc)+... Q"H/RMo-  
        cqhybcf(1:iefbc,1:jebc).*(ezbcf(2:ibfbc,1:jebc)-ezbcf(1:iefbc,1:jebc)); ;RYIc0%  
    ezxbcf(2:iefbc,1:jebc)=caezxbcf(2:iefbc,1:jebc).*ezxbcf(2:iefbc,1:jebc)+... -_XTy!I  
        cbezxbcf(2:iefbc,1:jebc).*(hybcf(2:iefbc,1:jebc)-hybcf(1:iefbc-1,1:jebc)); e0hY   
    ezybcf(1:ibbc,2:jebc)=caezybcf(1:ibbc,2:jebc).*ezybcf(1:ibbc,2:jebc)+... %^[D+1ULb  
        cbezybcf(1:ibbc,2:jebc).*(hxbcf(1:ibbc,2:jebc)-hxbcf(1:ibbc,1:jebc-1)); &d\ y:7  
    % up ;*0?C'h=  
    hxbcb(1:ibfbc,2:jebc)=cphxbcb(1:ibfbc,2:jebc).*hxbcb(1:ibfbc,2:jebc)+... ~ 7<M6F  
        cqhxbcb(1:ibfbc,2:jebc).*(ezbcb(1:ibfbc,2:jebc)-ezbcb(1:ibfbc,1:jebc-1)); me-uPm  
    hybcb(1:iefbc,1:jebc)=cphxbcb(1:iefbc,1:jebc).*hxbcb(1:iefbc,1:jebc)+... X!m lC51  
        cqhybcb(1:iefbc,1:jebc).*(ezbcb(2:ibfbc,1:jebc)-ezbcb(1:iefbc,1:jebc)); OsKtxtLO  
    ezxbcb(2:iefbc,1:jebc)=caezxbcb(2:iefbc,1:jebc).*ezxbcb(2:iefbc,1:jebc)+... K|I<kA~!H  
        cbezxbcb(2:iefbc,1:jebc).*(hybcb(2:iefbc,1:jebc)-hybcb(1:iefbc-1,1:jebc)); LL==2KNUo  
    ezybcb(1:ibbc,1:jebc-1)=caezybcb(1:ibbc,1:jebc-1).*ezybcb(1:ibbc,1:jebc-1)+... P~%+K
xwZQ  
        cbezybcb(1:ibbc,1:jebc-1).*(hxbcb(1:ibbc,2:jebc)-hxbcb(1:ibbc,1:jebc-1)); %< `D'V@  
    b7B|$T,  
    M~~)tJYsu  
% ezx 7mE9Zo1  
% left line 5]n\E?V'L  
ezbcl(1,2:je)=ezbcln(2,2:je)+(cc*dt-dx)/(cc*dt+dx)*(ezbcl(2,2:je)-... gU1Pb]]  
    ezbcl(1,2:je))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcl(1,2:je)-... W6B"QbHYz  
    hxbcl(1,1:je-1)+hxbcl(2,2:je)-hxbcl(2,1:je-1)); KtGbpcS$f  
ezbcf(1,2:jebc)=ezbcfn(2,2:jebc)+(cc*dt-dx)/(cc*dt+dx)*(ezbcf(2,2:jebc)-... zE~Xxp  
    ezbcf(1,2:jebc))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcf(1,2:jebc)-... o=Y'ns^a(  
    hxbcf(1,1:jebc-1)+hxbcf(2,2:jebc)-hxbcf(2,1:jebc-1)); x_r*<?OZ  
ezbcb(1,1:jebc-1)=ezbcbn(2,1:jebc-1)+(cc*dt-dx)/(cc*dt+dx)*(ezbcb(2,1:jebc-1)-... bP>Kx-%q  
    ezbcb(1,1:jebc-1))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcb(1,2:jebc)-... #/{3qPN?@  
    hxbcb(1,1:jebc-1)+hxbcb(2,2:jebc)-hxbcb(2,1:jebc-1)); mi[8O$^iJ  
ezbcl(1,1)=ezbcln(2,1)+(cc*dt-dx)/(cc*dt+dx)*(ezbcl(2,1)-... w^U{e xo  
    ezbcl(1,1))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcl(1,1)-... IhOAMH1  
    hxbcf(1,jebc)+hxbcl(2,1)-hxbcf(2,jebc)); Xt +9z  
ezbcl(1,jb)=ezbcln(2,jb)+(cc*dt-dx)/(cc*dt+dx)*(ezbcl(2,jb)-... $lq.*UQ;0  
    ezbcl(1,jb))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcb(1,1)-... M=3gV?N  
    hxbcl(1,je)+hxbcb(2,1)-hxbcl(2,je)); KC)}Mzt6_  
% right line AREjS$  
ezbcr(iebc,2:je)=ezbcrn(iebc-1,2:je)+(cc*dt-dx)/(cc*dt+dx)*(ezbcr(iebc-1,2:je)-... opMnLor  
    ezbcr(iebc,2:je))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcr(iebc,2:je)-... 7VL|\^Y`q  
    hxbcr(iebc,1:je-1)+hxbcr(iebc-1,2:je)-hxbcr(iebc-1,1:je-1)); `evF?t11X  
ezbcf(ibfbc,2:jebc)=ezbcfn(ibfbc-1,2:jebc)+... {8h[
Bd  
    (cc*dt-dx)/(cc*dt+dx)*(ezbcf(ibfbc-1,2:jebc)-... 'gHg&E9E&  
    ezbcf(ibfbc,2:jebc))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcf(ibfbc,2:jebc)-... Qxk& J  
    hxbcf(ibfbc,1:jebc-1)+hxbcf(ibfbc-1,2:jebc)-hxbcf(ibfbc-1,1:jebc-1)); Kxg@(Q  
ezbcb(ibfbc,1:jebc-1)=ezbcbn(ibfbc-1,1:jebc-1)+... A0:rn\$l3  
    (cc*dt-dx)/(cc*dt+dx)*(ezbcb(ibfbc-1,1:jebc-1)-... AQmHa2P  
    ezbcb(ibfbc,1:jebc-1))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcb(ibfbc,2:jebc)-... B9Hib1<8  
    hxbcb(ibfbc,1:jebc-1)+hxbcb(ibfbc-1,2:jebc)-hxbcb(ibfbc-1,1:jebc-1)); 5{
bc&?"  
ezbcr(iebc,1)=ezbcln(iebc-1,1)+(cc*dt-dx)/(cc*dt+dx)*(ezbcl(iebc-1,1)-...
[2h.5.af  
    ezbcl(iebc,1))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcr(iebc,1)-... XK})?LTD  
    hxbcf(ibbc,jebc)+hxbcr(2,1)-hxbcf(ibbc-1,jebc)); {`,)<R>}  
ezbcr(iebc,jb)=ezbcln(iebc,jb)+(cc*dt-dx)/(cc*dt+dx)*(ezbcl(iebc-1,jb)-... vrcIwCa  
    ezbcl(iebc,jb))+cc^2*muz*dt/(2*(cc*dt+dx))*(hxbcb(iebc,1)-... Gr#3GvL  
    hxbcl(iebc,je)+hxbcb(iebc-1,1)-hxbcl(iebc-1,je)); V1~@   
% left down corner !F.h+&^D
;  
ezbcf(1,1)=ezbcfn(2,2)+... >Fs/Wet  
    (cc*dt-2^(1/2)*dx)/(cc*dt+2^(1/2)*dx)*(ezbcf(2,2)-... {Wu[e,p  
    ezbcf(1,1)); " m13HS  
% right down corner *QV"o{V  
ezbcf(ibbc,1)=ezbcbn(ibbc-1,2)+... jFUpf.v2  
    (cc*dt-2^(1/2)*dx)/(cc*dt+2^(1/2)*dx)*(ezbcb(ibbc-1,2)-... 5~j#Z (}u  
    ezbcf(ibbc,1)); )]s<Czm%  
% left up corner "%
p7ft  
ezbcb(1,jebc)=ezbcbn(2,jebc-1)+... ,~DV0#"  
    (cc*dt-2^(1/2)*dx)/(cc*dt+2^(1/2)*dx)*(ezbcb(2,jebc-1)-... "%\hDL;  
    ezbcb(1,jebc)); 2;0eW&e   
% right up corner =E<H_cUS  
ezbcb(ibbc,jebc)=ezbcbn(ibbc-1,jebc-1)+... =1@LMIi5x  
    (cc*dt-2^(1/2)*dx)/(cc*dt+2^(1/2)*dx)*(ezbcb(ibbc-1,jebc-1)-... |Wjpnz  
    ezbcb(ibbc,jebc)); 9g>)7Ne  
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% tym:C7v%~  
% ezy _^NyLI%  
% bcl:up down lRb>W31"  
    ezybcl(1:iebc,1)=caezybcl(1:iebc,1).*ezybcl(1:iebc,1)+... T6QRr}8`/J  
        cbezybcl(1:iebc,1).*(hxbcl(1:iebc,1)-hxbcf(1:iebc,jebc)); 6)7cw8^  
    ezybcl(1:iebc,jb)=caezybcl(1:iebc,jb).*ezybcl(1:iebc,jb)+... =4l @A>  
        cbezybcl(1:iebc,jb).*(hxbcb(1:iebc,1)-hxbcl(1:iebc,je)); Fk^N7EJ:$  
    %bcr: up down j[.nk  
    ezybcr(1:iebc,1)=caezybcr(1:iebc,1).*ezybcr(1:iebc,1)+... g5lb3`a3  
        cbezybcl(1:iebc,1).*(hxbcr(1:iebc,1)-hxbcf(1:iebc,jebc)); 0^sY>N"  
    ezybcr(1:iebc,jb)=caezybcr(1:iebc,jb).*ezybcr(1:iebc,jb)+... ]!&$&t8.  
        cbezybcl(1:iebc,jb).*(hxbcb(1:iebc,1)-hxbcr(1:iebc,je)); {M5t)-  
    % bcf: down eLnS1w2  
    ezybcf(2:iefbc,1)=ezybcfn(2:iefbc,2)+... Q$v00z]f*  
        (cc*dt-dx)/(cc*dt+dx)*(ezybcf(2:iefbc,2)-ezybcf(2:iefbc,1))-...              %注意公式中正负 U7?v4O]D[  
        cc*cc*muz*dt/2*(cc*dt+dx)*(hybcf(1:iefbc-1,1)-... ixSr*+  
        hybcf(2:iefbc,1)+hybcf(1:iefbc-1,2)-hybcf(2:iefbc,2)); CS~_>bn  
    % bcb: up }YVF fi~  
    ezybcb(2:iefbc,jebc)=ezybcbn(2:iefbc,jebc-1)+... zRou~Kxi  
        (cc*dt-dx)/(cc*dt+dx)*(ezbcb(2:iefbc,jebc-1)-ezbcb(2:iefbc,jebc))-... 5doi4b>]!  
        cc*cc*muz*dt/2*(cc*dt+dx)*(hybcb(1:iefbc-1,jebc)-... *tgu@9b  
   &n .. ^ nI2<P  
G!;PV^6x  

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