FQL v4 will be decommissioned on June 30, 2025. Ensure that you complete your migration from FQL v4 to FQL v10 by that date.

For more details, see the v4 EOL announcement and migration guide. Contact support@fauna.com with any questions.

Ln

This reference topic applies to FQL v4. Go to this page for the latest FQL v10 reference topics.

Ln( value )
ln( value )
Ln( value )
Ln( value )
Ln( value )

Description

The Ln function returns the natural logarithm (base e) of the operand.

Parameters

Parameter Type Definition and Requirements

value

Number

Take the ln of this value.

Returns

A Number which is the result of the Ln operation.

Examples

The query in the following example returns the logarithm base e of the value 0.5:

client.query(
  q.Ln(0.5)
)
.then((ret) => console.log(ret))
.catch((err) => console.error(
  'Error: [%s] %s: %s',
  err.name,
  err.message,
  err.errors()[0].description,
))
-0.6931471805599453
result = client.query(
  q.ln(0.5)
)
print(result)
-0.6931471805599453
result, err := client.Query(
	f.Ln(0.5))

if err != nil {
	fmt.Fprintln(os.Stderr, err)
} else {
	fmt.Println(result)
}
-0.6931471805599453
try
{
    Value result = await client.Query(
        Ln(0.5)
    );
    Console.WriteLine(result);
}
catch (Exception e)
{
    Console.WriteLine($"ERROR: {e.Message}");
}
DoubleV(-0.6931471805599453)
Ln(0.5)
-0.6931471805599453
Query metrics:
  •    bytesIn:  10

  •   bytesOut:  32

  • computeOps:   1

  •    readOps:   0

  •   writeOps:   0

  •  readBytes:   0

  • writeBytes:   0

  •  queryTime: 1ms

  •    retries:   0

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