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function r=download_rate(H,C,L,U)
w=zeros(1,H);  %H¸öºÐ×Ó¶¼ÖÃÁã
w1=randperm(length(w));  %²úÉúËæ»úÊýÁÐ
w(w1(1:C))=1;             %È¡ÊýÁеÄǰC¸öÊý£¬ÏàÓ¦µÄʹºÐ×ÓÖÃ1
for m=1:U
s=randperm(length(w));   %ÔÙÉú³ÉÒ»×éËæ»úÊýÁÐ
X=w(s(1:L));               %²úÉúËæ»úµÄL¸öºÐ×Ó£¬¶ÔÓ¦µÃµ½xµÄÖµ\
r=0;
if sum(X)>=1
    r=r+1;
else
    r=r+sum(X);                    %µÃ³öminµÄÖµ
end
end

ÔËÐУºH=50;
L=4;
U=20;
C=[1:50];
for i=1:50
r(i)=download_rate(H,C(i),L,U);
end
plot(c,r)

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°®ÏßÏßlove

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