LogFunction (Solr 9.0.0 analytics API)

java.lang.Object
- org.apache.solr.analytics.function.mapping.LogFunction

```
public class LogFunction
extends Object
```
A logarithm mapping function.
Uses:
- If one numeric Value or ValueStream is passed in, a DoubleValue or DoubleValueStream representing the natural logarithm is returned.
- If two numeric Values are passed in, a DoubleValue representing the logarithm of the first with the second as the base is returned.
- If a numeric ValueStream and a numeric Value are passed in, a DoubleValueStream representing the logarithm of the Value with each of the values of the ValueStream for a document as the base is returned. (Or the other way, since the Value and ValueStream can be used in either order)

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static ExpressionFactory.CreatorFunction creatorFunction
  
  static String name
- Constructor Summary
  
  Constructors
  Constructor Description
  
  LogFunction()
- Method Summary
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

name
```
public static final String name
```
See Also:

Constant Field Values

creatorFunction

public static final ExpressionFactory.CreatorFunction creatorFunction

Constructor Detail
- LogFunction
```
public LogFunction()
```