Returns a Double specifying the natural logarithm of a number.
Log(num) |
The required num argument is a Double or any valid numeric expression greater than zero. If this argument is a non-initialized variable, or Null, an error occurs.
The natural logarithm is the logarithm to the base e. The constant e is approximately 2.718282.
You can calculate base-n logarithms for any number x by dividing the natural logarithm of x by the natural logarithm of n as follows:
Log n(x) = Log(x) / Log(n)
The following example illustrates a custom Function that calculates base-10 logarithms:
Function Log10(X) Log10 = Log(X) / Log(10) End Function |
See Also |
Exp Function |