log

Natural logarithm

&reftitle.description; `float` `log` `float` `arg` `float` `base` M_E

If the optional `base` parameter is specified, `log` returns logbase `arg`, otherwise `log` returns the natural logarithm of `arg`.

&reftitle.parameters;

`arg`

- The value to calculate the logarithm for

`base`

- The optional logarithmic base to use (defaults to 'e' and so to the natural logarithm).

&reftitle.returnvalues;

The logarithm of `arg` to `base`, if given, or the natural logarithm.

&reftitle.changelog;

&Version; | &Description;
4.3.0 | The optional parameter `base` became available. For older versions you can calculate the logarithm in base `b` of a number `n`, but using the mathematical identity: logb(n) = log(n)/log(b), where log is the neperian (or natural) logarithm.

&reftitle.seealso;

- `log10`
- `exp`
- `pow`