atan()#

relationalai.std.math
atan(number: Number | Producer) -> Expression

Calculates the arctangent of a number. Must be called in a rule or query context.

Parameters#

NameTypeDescription
numberNumber or ProducerThe number to take the arctangent of.

Returns#

An Expression object that produces float values.

Example#

atan() works with both numeric producers and Python number objects:

import relationalai as rai
from relationalai.std import alias
from relationalai.std.math import atan

# 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=3, height_m=0.95)

# atan() works with numeric producers, such as a person's height property.
# Inputs are assumed to be in radians.
with model.query() as select:
    person = Person()
    response = select(person.name, alias(atan(person.height_m), "atan_height"))

print(response.results)
# Output:
#     name  atan_height
# 0  Alice     0.759763

# atan() also works with Python number objects.
with model.query() as select:
    response = select(atan(0))

print(response.results)
# Output:
#      v
# 0  0.0

See Also#