org.apache.pig.piggybank.evaluation.math

Class LOG1P

java.lang.Object

org.apache.pig.EvalFunc<java.lang.Double>

org.apache.pig.piggybank.evaluation.math.Base

org.apache.pig.piggybank.evaluation.math.DoubleBase

org.apache.pig.piggybank.evaluation.math.LOG1P

public class LOG1P
extends DoubleBase

math.LOG1P implements a binding to the Java function Math.log1p(double). Given a single data atom it Returns the natural logarithm of the sum of the argument and 1.

Parameters:

value - Double.

Return Value:

Double

Return Schema:

LOG1P_inputSchema

Example:

register math.jar;
A = load 'mydata' using PigStorage() as ( float1 );
B = foreach A generate float1, math.LOG1P(float1);

Author:

ajay garg

See Also:

Math.log1p(double),

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.pig.EvalFunc

EvalFunc.SchemaType

Field Summary

Fields inherited from class org.apache.pig.EvalFunc

log, pigLogger, reporter, returnType

Constructor Summary

Constructors

Constructor and Description
LOG1P()

Method Summary

Methods inherited from class org.apache.pig.piggybank.evaluation.math.DoubleBase

exec, getArgToFuncMapping

Methods inherited from class org.apache.pig.piggybank.evaluation.math.Base

outputSchema

Methods inherited from class org.apache.pig.EvalFunc

allowCompileTimeCalculation, finish, getCacheFiles, getInputSchema, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, getSchemaType, getShipFiles, isAsynchronous, progress, setInputSchema, setPigLogger, setReporter, setUDFContextSignature, warn

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LOG1P

public LOG1P()