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$sinh（表达式操作符）

$sinh

返回以弧度为单位来测量的某一值的双曲正弦值。

$sinh 通过以下语法实现：

{ $sinh: <expression> }

$sinh takes any valid expression that resolves to a number, measured in radians. If the expression returns a value in degrees, use the $degreesToRadians operator to convert the value to radians.

默认下，$sinh 128 $sinh返回double<expression> 128形式的值。如果解析为位十进制值，还可以返回位十进制值。

有关表达式的更多信息，请参阅表达式。

行为

`null`、`NaN` 和`+/- Infinity`

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

例子	结果
`{ $sinh: NaN }`	`NaN`
`{ $sinh: null }`	`null`
`{ $sinh: -Infinity }`	`-Infinity`
`{ $sinh: Infinity }`	`Infinity`

例子

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( "5c50782193f833234ba90d25" ),
      "angle" : Decimal128( "53.1301023541559787031443874490659" )
   }
)

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

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

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

示例输出：

{
   "_id" : ObjectId("5c50782193f833234ba90d25"),
   "angle" : Decimal128("53.1301023541559787031443874490659"),
   "sinh_output" : Decimal128("1.066020404405732132503284522731829")
}

由于angle 128存储为$sinh 位十进制数，因此输出也是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( "5c50782193f833234ba90d35" ),
      "angle" : Decimal128( "1.6301023541559787031443874490659" )
   }
)

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

db.trigonometry.aggregate( [
   {
      $addFields : {
         "sinh_output" : { $sinh : "$angle" }
      }
   }
] )

示例输出：

{
   "_id" : ObjectId("5c50782193f833234ba90d35"),
   "angle" : Decimal128("1.6301023541559787031443874490659"),
   "sinh_output" : Decimal128("2.454243813557362033961729701069671")
}

Because angle is stored as a 128-bit decimal, the $sinh output is also a 128-bit decimal.

$sinh（表达式操作符）

行为

null、NaN 和+/- Infinity

例子

`null`、`NaN` 和`+/- Infinity`