relationalai.std.math.log10()
log10(value: Number|Producer) -> Expression
Calculates the base-10 logarithm of value
.
If value
is a Producer
, log10()
filters out any non-numeric or negative values from the producer.
Must be called in a rule or query context.
Parameters
Section titled “Parameters”Name | Type | Description |
---|---|---|
value | Producer or Python Number object | The number to take the base-10 logarithm of. |
Returns
Section titled “Returns”An Expression
object.
Example
Section titled “Example”Use log10()
to calculate the base-10 logarithm of a number:
import relationalai as raifrom relationalai.std import math
# =====# SETUP# =====
model = rai.Model("MyModel")Person = model.Type("Person")
with model.rule(): Person.add(id=1).set(name="Alice", age=100) Person.add(id=2).set(name="Bob", age=-10) # Negative age Person.add(id=3).set(name="Carol", age="INVALID") # Non-numeric age
# =======# EXAMPLE# =======
# Set an age_log10 property to the base-10 logarithm of each person’s age.with model.rule(): person = Person() person.set(age_log10=math.log10(person.age))
# Since log10() filters out negative and non-numeric values, the age_log10# property is not set for Bob or Carol.with model.query() as select: person = Person() response = select(person.id, person.name, person.age_log10)
print(response.results)# id name age_log10# 0 1 Alice 2.0# 1 2 Bob NaN# 2 3 Carol NaN