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t=linspace(0,0.0001,10000);%´Ó0µ½28È¡10000¸öµã£¬µãÔ½¶àÔ½¾«È·
v1=88.46,v2=0,I1=5.4008*10^-9,I2=4.9764*10^-5,I3=3.788*10^-6,I4=2.75^10-7,B=2.84,d0=0.0002;
x=I1*log(I4*t/I1+1/v1)/I4-I1*log(1/v1)/I4;
y=-(I1*I2+I1*I3*v2)*exp(-I3*t/I1)/I3/I3+I2*t/I3-(I1*I2+I1*I3*v2)/I3/I3;
dl=sqrt(diff(x).^2+diff(y).^2);%ÿС¶ÎÏ߶γ¤
l=sum(dl); %Çó×ܳ¤
disp(l);
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