The log2 function returns the (base-2) logarithm function.

Syntax ​

log2( X )

Arguments ​

• X: A real number greater than 0.

Results ​

• The logarithm is the base-2 logarithm: the inverse of the exponential function (exp) with base 2.
• null if the argument is negative or null or can’t be converted to a real value.

Examples ​

This returns 4:

print log2( 16 )