Difference between revisions of "Documentation/How Tos/Calc: FACTDOUBLE function"

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'''[[Documentation/How_Tos/Calc: Mathematical functions|Mathematical functions]]'''
 
'''[[Documentation/How_Tos/Calc: Mathematical functions|Mathematical functions]]'''
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[[Documentation/How_Tos/Calc: Functions listed alphabetically|'''Functions listed alphabetically''']],
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[[Documentation/How_Tos/Calc: Functions listed by category|'''Functions listed by category''']]
  
 
=== Issues: ===
 
=== Issues: ===
 
* This function currently appears in the AddIn category of the Function Wizard.
 
* This function currently appears in the AddIn category of the Function Wizard.

Revision as of 07:22, 13 September 2008


FACTDOUBLE

Returns the double factorial of a number.

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

Syntax:

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.

Example:

FACTDOUBLE(5)

returns 15.

FACTDOUBLE(6)

returns 48.

FACTDOUBLE(0)

returns 1.

See also:

FACT, MULTINOMIAL, PRODUCT

Mathematical functions

Functions listed alphabetically, Functions listed by category

Issues:

  • This function currently appears in the AddIn category of the Function Wizard.
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