log (JavaScript)

Gets the natural logarithm (base e) of a number.

Defined in

log(value:double) : double

Parameter	Description
`value`	A positive number. See below for special cases.

Return value	Description
`double`	The natural logarithm of the parameter.

Special cases are as follows:

See exp (JavaScript) for the inverse to this method.

To get the logarithm to the base 10 of a number, multiply the return value of this method by LOG10E (JavaScript).

To get the logarithm to the base 2 of a number, multiply the return value of this method by LOG2E (JavaScript).

(1) This button onclick event calculates the cube root of a number.

sessionScope.result = 
	Math.exp(Math.log(sessionScope.n) / 3)

(2) This button onclick event gets the logarithm of a number to the base 10.

sessionScope.log10 = Math.log(sessionScope.n) * Math.LOG10E

(3) This button onclick event gets the logarithm of a number to the base 2.

sessionScope.log2 = Math.log(sessionScope.n) * Math.LOG2E