log factorial

Calculates the logarithm of the factorial with given argument.

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Interface
Log Factorial
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Interface

C++

Excel

Log Factorial

doublelog_factorial( int n )

This function calculates the following expression

$\mathrm{log factorial}(n) = \mathrm{ln}\,n!$

(2)

In the given example, values of this function are returned for various integral values of the argument from 1 up to 10.

Example 1

#include <codecogs/maths/arithmetic/log_factorial.h>
#include <iostream>
#include <iomanip>
 
int main()
{
  std::cout << std::setprecision(10);
  for (int i = 1; i <= 10; i++)
  {
    std::cout << "log_factorial(" << i << ") = ";
    std::cout << Maths::Arithmetic::log_factorial(i);
    std::cout << std::endl;
  }
  return 0;
}

Output

log_factorial(1) = 0
log_factorial(2) = 0.6931471806
log_factorial(3) = 1.791759469
log_factorial(4) = 3.17805383
log_factorial(5) = 4.787491743
log_factorial(6) = 6.579251212
log_factorial(7) = 8.525161361
log_factorial(8) = 10.6046029
log_factorial(9) = 12.80182748
log_factorial(10) = 15.10441257

Parameters

n	the argument of the factorial

Returns

the logarithm of the factorial with given argument n

Authors

Lucian Bentea (September 2005)

Source Code

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