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$tanh (aggregation)

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$tanh

以弧度为单位返回数值的双曲正切值。

$tanh 采用以下语法:

{ $tanh: <expression> }

$tanh接受解析为数字的任何有效表达式,以弧度为单位。 如果表达式返回以度为单位的值,请使用$degreesToRadians操作符将该值转换为弧度。

默认情况下, $tanhdouble形式返回值。 如果<expression>解析为128位十进制值, $tanh还可以返回128位十进制值。

有关表达式的更多信息,请参阅表达式运算符。

If the input argument resolves to a value of null or refers to a field that is missing, $tanh returns null. If the argument resolves to NaN, $tanh returns NaN. If the argument resolves to negative or positive Infinity, $tanh returns -1 or 1 respectively.

例子
结果

{ $tanh: NaN }

NaN

{ $tanh: null }

null

{ $tanh: -Infinity }

-1

{ $tanh: Infinity }

1

trigonometry以下collection包含一个文档,其中存储了一个以度数为单位的angle 值:

db.trigonometry.insertOne(
{
"_id" : ObjectId( "5c50782193f833234ba90d45" ),
"angle" : NumberDecimal( "53.1301023541559787031443874490659" )
}
)

The following aggregation operation uses the $tanh expression to calculate the hyperbolic tangent of angle and adds it to the input document using the $addFields pipeline stage:

db.trigonometry.aggregate( [
{
$addFields : {
"tanh_output" : { $tanh : { $degreesToRadians : "$angle" } }
}
}
] )

$degreesToRadians表达式将以度为单位的angle转换为弧度。

示例输出:

{
"_id" : ObjectId("5c50782193f833234ba90d45"),
"angle" : NumberDecimal("53.1301023541559787031443874490659"),
"tanh_output" : NumberDecimal("0.7293303448445332820512777329448416")
}

由于angle存储为128位十进制数,因此$tanh输出也是128位十进制数。

以下trigonometry集合包含一个文档,其中存储了以弧度为单位的angle值:

db.trigonometry.insertOne(
{
"_id" : ObjectId( "5c50782193f833234ba90d55" ),
"angle" : NumberDecimal( "1.6301023541559787031443874490659" )
}
)

The following aggregation operation uses the $tanh expression to calculate the hyperbolic tangent of angle and adds it to the input document using the $addFields pipeline stage:

db.trigonometry.aggregate( [
{
$addFields : {
"tanh_output" : { $tanh : "$angle" }
}
}
] )

示例输出:

{
"_id" : ObjectId("5c50782193f833234ba90d55"),
"angle" : NumberDecimal("1.6301023541559787031443874490659"),
"tanh_output" : NumberDecimal("0.9260761562750713360156803177935379")
}

由于angle存储为128位十进制数,因此$tanh输出也是128位十进制数。

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