Name

specfun_factoriallog — The log-factorial function

Calling Sequence

   flog = specfun_factoriallog ( n )
   
   

Parameters

n :

a matrix of floating point integers, must be positive

flog :

a matrix of floating point integers

Description

Returns the logarithm of the factorial of n.

This function overflows as soon as x>1.e306.

Examples

// Generates an error: this is not an integer
specfun_factoriallog(1.5)

// Generates an error: this is not positive
specfun_factoriallog(-1)

// Plot the function
scf();
plot(0:170,specfun_factoriallog)

   

Authors

Michael Baudin - 2010

Bibliography

"Introduction to discrete probabilities", Michael Baudin, 2010