1. 雷电
tic; 1x=100; 1y=100; a=(cos(pi/lx)+cos(pi/ly))/2; w=2/(1+sqrt(1-a*a)); v1=zeros(ly,1x); v=V1; r=3; trace=V; fori=1:ly forj=1:1x v1(ij)=(i-1)*100/(1y-1); end end o=sqrt(2); v(1,:)=1; v(ly,:)=1; V(:,1)=1; v(:,1x)=1; k=0; i=2; j=fix(lx/2); while(v(ij)~=1) v(i,j)=2; trace(ij)=1; v1(i,j)=0; V2=V1; maxt=1; while(maxt>1e-5) k=k+1; maxt=0; for m=2:ly-1 for n=2:1x-1; if v(m,n)==0 v2(m,n)=v2(m,n)+w*(v1(m,n+1)+v1(m+1,n)+v2(m-1,n)+v2(m,n-1)-4*v2(m,n))/4; t=abs(v2(m,n)-v1(m,n)); if(t>maxt)maxt=t; end end end V1=v2; end p=0; for i=2:1y-1 for j=2:1x-1 if(v(ij)==2) if(v(i-1j)==2)p1=0; else p1=v1(i-1j)"r; end; if(v(i+1j)==2)p2=0; else p2=v1(i+1j)~r; end; if(v(ij-1)==2)p3=0; else p3=v1(ij-1)~r; end; if(v(ij+1)==2)p4=0; else p4=v1(ij+1)~r; end; if(v(i-1j-1)==2)p5=0; else p5=(v1(i-1j-1)/o)~r; end; if(v(i-1j+1)==2)p6=0; else p6=(V1(i-1.j+1)/o)^r; end; if(v(i+1j-1)==2)p7=0; else p7=(v1(i+1.j-1)/o)"r; end; if(v(i+1j+1)==2)p8=0; else p8=(v1(i+1j+1)/o)~r; end; p=p1+p2+p3+p4+p5+p6+p7+p8+p; end end; end; g=rand(1,1); s=0; for i=2:1y-1 for j=2:1x-1 if(v(ij)==2) if(v(i-1j)==2) p1=0; else p1=(vl(i-1j)"r/p); end; if(v(i+1j)==2)p2=0; else p2=(v1(i+1j)~r/p); end; if(v(ij-1)==2)p3=0; else p3=(v1(ij-1)~r/p); end; if(v(ij+1)==2)p4=0; else p4=(v1(ij+1)~r/p); end; if(v(i-1j-1)==2)p5=0; else p5=((V1(i-1.j-1)/o)~r)/p; end; if(v(i-1j+1)==2)p6=0; else p6=((v1(i-1j+1)/o)~r)/p; end; if(v(i+1j-1)==2)p7=0; else p7=((v1(i+1.j-1)/o)~r)/p; end; if(v(i+1j+1)==2)p8=0; else p8=((V1(i+1j+1)/o)~r)/p; end; s=S+p1+p2+p3+p4+p5+p6+p7+p8; if(q>=s-p1-p2-p3-p4-p5-p6-p7-p8)&&(q<S-p2-p3-p4-p5-p6-p7-p8) m=i-1;n=j; end; if(q>=S-p2-p3-p4-p5-p6-p7-p8)&&(q<S-p3-p4-p5-p6-p7-p8) m=i+1;n=j; end; if(q>=-p3-p4-p5-p6-p7-p8)&&(q<s-p4-p5-p6-p7-p8) m=i;n=j-1; end; if(q>=s-p4-p5-p6-p7-p8)&&(q<=S-p5-p6-p7-p8) m=i;n=j+1; end; if(q>=s-p5-p6-p7-p8)&&(q<=s-p6-p7-p8) m=i-1;n=j-1; end; if(q>=s-p6-p7-p8)&&(q<=s-p7-p8) m=i-1;n=j+1; end; if(q>=S-p7-p8)&&(q<=S-p8) m=i+1;n=j-1; end; if(q>=S-p8)&&(q<=s) m=i+1;n=j+1; end; end end end i=m j=n; end k toc; time=toc; im=pcolor(trace) colormap(cool); set(im,'LineStyle','none');