$log10 (aggregation)
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Definition
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$log10
-
New in version 3.2.
Calculates the log base 10 of a number and returns the result as a double.
$log10
has the following syntax:The
<number>
expression can be any valid expression as long as it resolves to a non-negative number. For more information on expressions, see Expressions.$log10
is equivalent to$log: [ <number>, 10 ]
expression.
Behavior
If the argument resolves to a value of null
or refers to a field that is missing, $log10
returns null
. If the argument resolves to NaN
, $log10
returns NaN
.
Example | Results |
---|---|
{ $log10: 1 } |
0 |
{ $log10: 10 } |
1 |
{ $log10: 100 } |
2 |
{ $log10: 1000 } |
3 |