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dt=0.1;
time=1000;
A=5;
T=time/dt;
t=1:T;
I0=A*randn(T,1);
aa=1;
bb=ones(1,50/dt)/(50/dt);
I=filter(bb,aa,I0)';
I(find(I<0))=0;

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gwdavid(½ð±Ò+2,VIP+0):лл£¡ 6-30 19:11
kernelflyer(½ð±Ò+8,VIP+0): 7-18 11:10
aa=ones(1,50/dt);
bb=ones(1,50/dt)/(50/dt);
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