Services or capabilities described in AWS documentation might vary by Region. To see the differences applicable to the AWS European Sovereign Cloud Region, see the AWS European Sovereign Cloud User Guide.$acosh
New from version 8.0.1.
The $acosh operator in Amazon DocumentDB returns the inverse hyperbolic cosine (hyperbolic arccosine) of a value. The input value must be greater than or equal to 1.
Parameters
The return type is double by default. If the input is a 128-bit decimal, the output is also a 128-bit decimal.
Example (MongoDB Shell)
The following example shows how to use the $acosh operator to calculate the inverse hyperbolic cosine of numeric values.
Create sample documents
db.values.insertMany([
{ "_id": 1, "value": 1 },
{ "_id": 2, "value": 2 },
{ "_id": 3, "value": 10 }
]);
Query example
db.values.aggregate([
{ $project: {
"result": { $acosh: "$value" }
}}
]);
Output
[
{ "_id": 1, "result": 0 },
{ "_id": 2, "result": 1.3169578969248166 },
{ "_id": 3, "result": 2.993222846126381 }
]
Code examples
To view a code example for using the $acosh operator, choose the tab for the language that you want to use:
- Node.js
-
const { MongoClient } = require('mongodb');
async function main() {
const client = await MongoClient.connect('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false');
const db = client.db('test');
const collection = db.collection('values');
const result = await collection.aggregate([
{ $project: {
"result": { $acosh: "$value" }
}}
]).toArray();
console.log(result);
await client.close();
}
main();
- Python
-
from pymongo import MongoClient
def main():
client = MongoClient('mongodb://<username>:<password>@<cluster-endpoint>:27017/?tls=true&tlsCAFile=global-bundle.pem&replicaSet=rs0&readPreference=secondaryPreferred&retryWrites=false')
db = client['test']
collection = db['values']
result = list(collection.aggregate([
{ '$project': {
'result': { '$acosh': '$value' }
}}
]))
print(result)
client.close()
if __name__ == "__main__":
main()