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t=(1:1:200) counter=zeros(1,200); x(1)=0; y(1)=0; z(1)=0; x(2)=0; y(2)=0; z(2)=0.01; n=0; m=0; while(n<100000) s=0; h=0; for i=3:1:80 l=(-333)*log(rand(1)); b=acos(2*rand(1)-1); e=2*pi*rand(1); x(i)=x(i-1)+l*sin(b)*sin(e); y(i)=y(i-1)+l*sin(b)*cos(e); z(i)=z(i-1)+l*cos(b); a=z(i)-z(i-1); s=s+a; h=h+l; m=m+1 n; if(s)>900 x(i); y(i) m; break end end t=round(abs(h)/60); if abs(x(i))<25000 if abs(y(i))<25000 counter(t)=counter(t)+1; p=x(i); q=y(i) end end n=n+1; end plot(t, counter(t)); ´úÂëÈçÉÏ£¬ÎÊÌ⣺¾ÍÊÇÕâ¸öforÑ»·ÀïÃæµÄiÉèÖÃfor i=3:1:80£¬ÎÒÉèÖÃiµÈÓÚ²»³¬¹ýÎåÊ®×óÓÒʱ£¬Õâ¸ö³ÌÐòÅܵÄͨ£¬µ±³¬¹ýÕâ¸öÊýֵʱ¾ÍÌø³öË÷Òý³¬³ö¾ØÕóά¶È¡£Çó½â¾ö£¬ÐÂÊÖÃþË÷Á½¸öÔÂÁË£¬¸Ð¼¤²»¾¡£¬×ö²»Í꣬¶¼Ã»·¨»Ø¼Ò¹ýÄêÁË£¬°¦£¬¹òл£¡ |
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