How to get the exact value of factorial(100)

Question

When I run factorial(100) in the console, I get

factorial(100)
# [1] 9.332622e+157

But I want to see the exact value of factorial(100). How would I do it?

score 6 · Accepted Answer · edited May 23 '17 at 11:44

6

The gmp library might do what you want. I have not verified that this is the correct result:

> library(gmp)
> j <- as.bigz(100)
> factorial(j)
Big Integer ('bigz') :
[1] 93326215443944152681699238856266700490715968264381621468592963895217599993229915608941463976156518286253697920827223758251185210916864000000000000000000000000

See also Multiplication of large integers in R

edited May 23 '17 at 11:44

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answered Dec 08 '15 at 23:57

Matthew Lundberg

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[seems right](http://www.geeksforgeeks.org/factorial-large-number/) if this is to be trusted – alexwhitworth Dec 09 '15 at 00:55

How to get the exact value of factorial(100)

1 Answers1