relationalai.std.math.radians()

radians(degrees: Number|Producer) -> Expression

Converts an angle from degrees to radians. If degrees is a Producer, radians() filters out any non-numeric values from the producer. Must be called in a rule or query context.

Parameters

Name	Type	Description
degrees	Producer or Python Number object	The angle in degrees to convert to radians.

Returns

An Expression object.

Example

Use radians() to convert an angle from degrees to radians:

import relationalai as rai
from relationalai.std import math


# =====
# SETUP
# =====

model = rai.Model("MyModel")
Angle = model.Type("Angle")

with model.rule():
    Angle.add(id=1).set(degrees=90)
    Angle.add(id=2).set(degrees=180)
    Angle.add(id=3).set(degrees="INVALID")  # Non-numeric value


# =======
# EXAMPLE
# =======

# Set a radians property to the radians equivalent of each angle's degrees value.
with model.rule():
    angle = Angle()
    angle.set(radians=math.radians(angle.degrees))

# Since radians() filters out non-numeric values, the radians property
# is not set for the angle with id=3.
with model.query() as select:
    angle = Angle()
    response = select(angle.id, angle.radians)

print(response.results)
#    id    radians
# 0   1   1.570796
# 1   2   3.141593
# 2   3        NaN

See Also

• degrees()