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p=0:0.01:100;ni=4e15*p;
% ³¬Ô½·½³Ì nf/ni=1+6.94e25/ni*log(nf/ni)
for i=1:length(ni);
     nf=fsolve(@(x)x/ni-1-6.94e25/ni*log(x/ni),1.63e27);
end;

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CODE:
clear all;clc
format long

p=0.01:1:100;nni=4e15*p;
% ³¬Ô½·½³Ì nf/ni=1+6.94e25/ni*log(nf/ni)
for i=1:length(nni);
     ni=nni(i);
     [nf(i) fval(i)]=fsolve(@(x)x/ni-1-6.94e25/ni*log(x/ni),ni);
end;
[4e15*p ; nf ]'
fval'

figure(1)
plot(4e15*p,nf)

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