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PARTIAL_FACTORIAL

PARTIAL_FACTORIAL

Name


PARTIAL_FACTORIAL

Purpose


This function calculates the partial factorial n!/(n-m)!.

Category


Mathematics

Calling Sequence


Result = PARTIAL_FACTORIAL( N, M )

Inputs


N: A positive integer (see Purpose).
M: A positive integer (see Purpose).

Output


Result: The value of N!/(N-M)!.

Uses


-

Procedure


This function multiplies all numbers between and including N and N-M+1.

Example


Calculate 4!/(4-2)!.
result = partial_factorial( 4, 2 )
The result should be 4*3*2*1/(2*1)=12.

Modification History


  Written by: Daithi A. Stone, 2004-11-22.



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