Name

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PARTIAL_FACTORIAL

Purpose

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

Category

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Mathematics

Calling Sequence

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Result = PARTIAL_FACTORIAL( N, M )

Inputs

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

Output

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

Uses

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-

Procedure

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

Example

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

Modification History

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