# Reference/log

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Revision as of 04:48, 13 April 2010 by Chris Burke (Talk | contribs)

## Contents |

## log (log function)

The `log` function computes the natural logarithm of its argument. The result is type float. Null is returned if the argument is negative, and negative infinity if the argument is 0.

## Syntax

q)r:log X

## Example

q)log 1 0f q)log 0.5 -0.6931472 q)log exp 42 42f q)log -2 0n 0 0.1 1 42 0n 0n -0w -2.302585 0 3.73767

## See also

For a complete list of functions, see the kdb+ Function Reference.