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 )
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)
System.out.println(
    client.query(
        Ln(Value(0.5))
    ).get());
-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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