$atan값의 역탄젠트(아크 탄젠트)를 반환합니다.
$atan의 구문은 다음과 같습니다:{ $atan: <expression> } $atantakes any valid expression that resolves to a number.$atanreturns values in radians. Use$radiansToDegreesoperator to convert the output value from radians to degrees.By default
$atanreturns values as adouble.$atancan also return values as a 128-bit decimal as long as the<expression>resolves to a 128-bit decimal value.표현식에 대한 자세한 내용은 표현식을 참조하세요 .
행동
null 개인정보 정책에 NaN
If the argument resolves to a value of null or refers to a field that is missing, $atan returns null. If the argument resolves to NaN, $tan returns NaN.
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예시
trigonometry 컬렉션에는 직각 삼각형의 세 변을 저장하는 문서가 포함되어 있습니다.
{ "_id" : ObjectId("5c50782193f833234ba90d85"), "side_a" : Decimal128("3"), "side_b" : Decimal128("4"), "hypotenuse" : Decimal128("5") }
The following aggregation operation uses the $atan expression to calculate the angle adjacent to side_a and add it to the input document using the $addFields pipeline stage.
db.trigonometry.aggregate([ { $addFields : { "angle_a" : { $radiansToDegrees : { $atan : { $divide : [ "$side_b", "$side_a" ] } } } } } ])
The $radiansToDegrees expression converts the radian value returned by $atan to the equivalent value in degrees.
이 명령은 다음 출력을 반환합니다.
{ "_id" : ObjectId("5c50782193f833234ba90d85"), "side_a" : Decimal128("3"), "side_b" : Decimal128("4"), "hypotenuse" : Decimal128("5"), "angle_a" : Decimal128("53.13010235415597870314438744090658") }
Since side_b and side_a are stored as 128-bit decimals, the output of $atan is a 128-bit decimal.
trigonometry 컬렉션에는 직각 삼각형의 세 변을 저장하는 문서가 포함되어 있습니다.
{ "_id" : ObjectId("5c50782193f833234ba90d85"), "side_a" : Decimal128("3"), "side_b" : Decimal128("4"), "hypotenuse" : Decimal128("5") }
The following aggregation operation uses the $atan expression to calculate the angle adjacent to side_a and add it to the input document using the $addFields pipeline stage.
db.trigonometry.aggregate([ { $addFields : { "angle_a" : { $atan : { $divide : [ "$side_b", "$side_a" ] } } } } ])
이 명령은 다음 출력을 반환합니다.
{ "_id" : ObjectId("5c50782193f833234ba90d85"), "side_a" : Decimal128("3"), "side_b" : Decimal128("4"), "hypotenuse" : Decimal128("5"), "angle_a" : Decimal128("0.9272952180016122324285124629224287") }
Since side_b and side_a are stored as 128-bit decimals, the output of $atan is a 128-bit decimal.