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log

Function

log natural logarithm

Synopsis

log(val: number) -> float64

Description

The log function returns the natural logarithm of its argument val, which must be numeric. The return value is a float64 or an error.

Examples

The logarithm of various numbers:

echo '4 4.0 2.718 -1' | zq -z 'yield log(this)' -

=>

1.3862943611198906
1.3862943611198906
0.999896315728952
error("log: illegal argument: -1")

The largest power of 10 smaller than the input:

echo '9 10 20 1000 1100 30000' | zq -z 'yield int64(log(this)/log(10))' -

=>

0
1
1
2
3
4