FACTDOUBLE function

FUNCTIONS

Trigonometric

Hyperbolic

Rounding and remainders

Logarithm/Powers

Bessel functions

Miscellaneous

FACTDOUBLE

Returns the double factorial of a number.

This function is only available if the Analysis AddIn is installed.

FACTDOUBLE(number)

returns number!!, the double factorial of number, where number is an integer greater than or equal to zero.

For even numbers FACTDOUBLE(number) returns:

2*4*6*8* ... *number

For odd numbers FACTDOUBLE(number) returns:

1*3*5*7* ... *number

FACTDOUBLE(0) returns 1 by definition.

FACTDOUBLE(5)

returns 15.

FACTDOUBLE(6)

returns 48.

FACTDOUBLE(0)

returns 1.

See Also