Reference/log

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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.

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