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#

NameTypeDescription
numberNumber or ProducerThe 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

See Also#