如果我计算factorial(100)然后我得到的答案是[1] 9.332622e+157但是当我尝试计算更大的阶乘时，比如说factorial(1000)我得到的答案是[1] Inf
有没有办法在计算阶乘时使用任意精度，以便我可以计算说factorial(1000000)?
对于任意精度，您可以使用gmp or Rmpfr。对于具体阶乘gmp offers factorialZ and Rmpfr has factorialMpfr。所以你可以运行如下所示的东西
> Rmpfr::factorialMpfr(200)
1 'mpfr' number of precision 1246 bits
[1] 788657867364790503552363213932185062295135977687173263294742533244359449963403342920304284011984623904177212138919638830257642790242637105061926624952829931113462857270763317237396988943922445621451664240254033291864131227428294853277524242407573903240321257405579568660226031904170324062351700858796178922222789623703897374720000000000000000000000000000000000000000000000000
> gmp::factorialZ(200)
Big Integer ('bigz') :
[1] 788657867364790503552363213932185062295135977687173263294742533244359449963403342920304284011984623904177212138919638830257642790242637105061926624952829931113462857270763317237396988943922445621451664240254033291864131227428294853277524242407573903240321257405579568660226031904170324062351700858796178922222789623703897374720000000000000000000000000000000000000000000000000
HTH
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