factorial-ln

compute log(n!) of huge numbers

example

var factorialln = require('factorial-ln')
factorialln(171) // would return Infinity with 'factorial' package

install

npm install factorial-ln

why?

By working with log(n) rather than n, we can deal with huge numbers without loss of precision, overflow, or underflow. No big number library is required, at least until we have reason to switch back into non-log. In many cases, such as where really big and really small numbers are only used internally in certain computations, we can completely avoid the use of a big number library.

Also, multiplication is much faster in log space (you add). The same for division (you divide). This is never a bad thing.

This module exports a single function which simply computes log(n!).

license

MIT