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$cosh
New from version 8.0.1.
The $cosh operator in Amazon DocumentDB returns the hyperbolic cosine of a value. Use it in the aggregation pipeline to perform hyperbolic trigonometric calculations on numeric fields.
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 $cosh operator to calculate the hyperbolic cosine of numeric values.
Create sample documents
db.values.insertMany([
{ "_id": 1, "value": 0 },
{ "_id": 2, "value": 1 },
{ "_id": 3, "value": -1 }
]);
Query example
db.values.aggregate([
{ $project: {
"result": { $cosh: "$value" }
}}
]);
Output
[
{ "_id": 1, "result": 1 },
{ "_id": 2, "result": 1.5430806348152437 },
{ "_id": 3, "result": 1.5430806348152437 }
]
Code examples
To view a code example for using the $cosh 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": { $cosh: "$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([
{ '$project': {
'result': { '$cosh': '$value' }
}}
]))
print(result)
client.close()
if __name__ == "__main__":
main()