cos()#
relationalai.std.math
#cos(number: Number | Producer) -> Expression
Calculates the cosine of a number. Must be called in a rule or query context.
Parameters#
Name | Type | Description |
---|---|---|
number | Number or Producer | The number to take the cosine of. |
Returns#
An Expression
object that produces float
values.
Example#
cos()
works with both numeric producers and Python number objects:
#import relationalai as rai
from relationalai.std import alias
from relationalai.std.math import cos
# Create a model named "people" with a Person type.
model = rai.Model("people")
Person = model.Type("Person")
# Add a person to the model.
with model.rule():
Person.add(name="Alice", age=30)
# cos() works with numeric producers, such as a person's age property.
# Inputs are assumed to be in radians.
with model.query() as select:
person = Person()
response = select(person.name, alias(cos(person.age), "cos_age"))
print(response.results)
# Output:
# name cos_age
# 0 Alice 0.154251
# cos() also works with Python number objects.
with model.query() as select:
response = select(cos(0))
print(response.results)
# Output:
# v
# 0 1.0