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%pp.m
function pp
N=0:999;
A=zeros(length(N),1);
for n=N
    A(n+1)=fun(n);
end
plot(N,A)

function  result=fun(N)
syms n m lambda c
n=sym(num2str(N));
lambda=sym('3000');
f=lambda^m/factorial(m); %ÇóºÍº¯Êý
S=lambda^n/factorial(n)/symsum(f,m,0,n);   %·Ö×ÓµÄ3000ÎÒÒ²ÊÇÓÃlambda´úÌæÁË
result=vpa(S,8);%ת»¯ÎªÊýÖµ

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