TreeTools (version 1.3.1)

DoubleFactorial: Double factorial

Description

Calculate the double factorial of a number, or its logarithm.

Usage

DoubleFactorial(n)
DoubleFactorial64(n)
LnDoubleFactorial(n)
Log2DoubleFactorial(n)
LogDoubleFactorial(n)
LnDoubleFactorial.int(n)
LogDoubleFactorial.int(n)

Arguments

n

Vector of integers.

Value

Returns the double factorial, n * (n - 2) * (n - 4) * (n - 6) * ...

Functions

• DoubleFactorial64: Returns the exact double factorial as a 64-bit integer64, for n < 34.

• LnDoubleFactorial: Returns the logarithm of the double factorial.

• Log2DoubleFactorial: Returns the logarithm of the double factorial.

• LnDoubleFactorial.int: Slightly faster, when x is known to be length one and below 50001

See Also

Other double factorials: doubleFactorials, logDoubleFactorials

Examples

# NOT RUN {
DoubleFactorial (-4:0) # Return 1 if n < 2
DoubleFactorial (2) # 2
DoubleFactorial (5) # 1 * 3 * 5
exp(LnDoubleFactorial.int (8)) # log(2 * 4 * 6 * 8)
DoubleFactorial64(31)
# }