Ruby | Math lgamma() function

The lgamma() function in Ruby returns two numbers, one represents the logarithmic gamma of value while the other signifies the sign of gamma of value.

Syntax: Math.lgamma(value)

Parameter: The function takes one mandatory parameter value whose logarithmic gamma is returned and its sign.

Return Value: The function returns two numbers, where one represents the logarithmic gamma of value while the other signifies the sign of gamma of value.

Example 1:

# Ruby program for lgamma() function

# Assigning values
val1 = 132
val2 = 0
val3 = -23
val4 = 1

# Prints the value returned by lgamma()
puts Math.lgamma(val1)
puts

puts Math.lgamma(val2)
puts

puts Math.lgamma(val3)
puts

puts Math.lgamma(val4)

Output:

511.00802266523596
1

Infinity
1

Infinity
1

0.0
1

Example 2:

# Ruby program for lgamma() function

# Assigning values
val1 = -1
val2 = 2
val3 = -2
val4 = -9

# Prints the value returned by lgamma()
puts Math.lgamma(val1)
puts

puts Math.lgamma(val2)
puts

puts Math.lgamma(val3)
puts

puts Math.lgamma(val4)

Output:

Infinity
1

0.0
1

Infinity
1

Infinity
1

Reference: https://devdocs.io/ruby~2.5/math#method-c-lgamma