Log()

Log()

Category: Number

Syntax: Log ( number )

Parameters: number ”any positive number or expression that returns a positive number.

Description: Returns the base-10 logarithm of number .

Examples:

 Log (1) 

Returns , because 10^0 = 1.

 Log (100) 

Returns 2 , because 10^2 = 100.

 Log (1000) 

Returns 3 , because 10^3 = 1000.

Comments:

Logarithms are used to determined the power to which a number must be raised to equal some other number. If x ⁿ = y, then n = Log _x (y) . The Log() function assumes a base (the variable x in the preceding formula) of 10. The Lg() function uses a base of 2, whereas the Ln() function uses a base of e .