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function y=fac(n)
if n<0
    error('n is smaller than 0,put in again !');
    return;
end
if n==0|n==1
    y=1;
else
    y=n*fac(n-1);
end
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n=10;
for i=1:n
fac(i)
end
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¼òµ¥µã¾ÍÓÃfactorial
n=1:10;
>> N=factorial(n)

N =

  Columns 1 through 9

           1           2           6          24         120         720        5040       40320      362880

  Column 10

     3628800
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