# Manuals/calci/LB

LB (Number)

• is any positive real number.

## Description

• This function shows the logarithm value of base 2.
• In , is any positive real number.
• LB means the logarithm with the base 2.
• So the Binary logarithm is the logarithm to the base 2.
• The Binary logarithm function is the inverse function of the power of two function.
• So for any real number x, ,.
• For example, the binary logarithm of 1 is 0, the binary logarithm of 2 is 1, the binary logarithm of 4 is 2, and the binary logarithm of 32 is 5.
• This function will return the result as NaN when the given number as negative.

## Examples

1. LB(20) = 4.321928094887363
2. LB(192) = 7.584962500721156
3. LB(5423) = 12.40487545501521

Log with base2