log

Description

Returns the logarithm of a number to a specified base. Common uses include modeling compound interest, exponential growth or decay, pH levels, and earthquake magnitudes.

Syntax

Like many functions in DataPrime, log supports two notations, function and method. These interchangeable forms allow flexibility in how you structure expressions.

Function notation

log(base: number, number: number): number

Method notation

(base: number).log(number: number): number

Arguments

Name	Type	Required	Description
base	number	true	The logarithmic base (e.g. 2 for log base 2)
number	number	true	The value whose logarithm will be computed

Example

Use case: Compute a log base 2 transformation

Calculate the log base 2 of a numerical field and store the result in a new field.

Example data

{
    "some_value": 16
}

Example query

Function notation

create log_field from log(2, some_value)

Method notation

create log_field from 2.log(some_value)

Example output

{
    "some_value": 16,
    "log_field": 4
}