org.apache.pig.piggybank.evaluation.math
Class FloatUlp

java.lang.Object
  extended by org.apache.pig.EvalFunc<Float>
      extended by org.apache.pig.piggybank.evaluation.math.FloatUlp

public class FloatUlp
extends EvalFunc<Float>

math.ULP implements a binding to the Java function Math.ulp(float). Given a single data atom it Returns the size of an ulp of the argument.

Parameters:
value - Float.
Return Value:
Float
Return Schema:
ULP_inputSchema
Example:
register math.jar;
A = load 'mydata' using PigStorage() as ( float1 );
B = foreach A generate float1, math.ULP(float1);

Author:
ajay garg
See Also:
Math.ulp(float),

Field Summary
 
Fields inherited from class org.apache.pig.EvalFunc
log, pigLogger, reporter, returnType
 
Constructor Summary
FloatUlp()
           
 
Method Summary
 Float exec(Tuple input)
          java level API
 Schema outputSchema(Schema input)
           
 
Methods inherited from class org.apache.pig.EvalFunc
finish, getArgToFuncMapping, getLogger, getPigLogger, getReporter, getReturnType, getSchemaName, isAsynchronous, progress, setPigLogger, setReporter, warn
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

FloatUlp

public FloatUlp()
Method Detail

exec

public Float exec(Tuple input)
           throws IOException
java level API

Specified by:
exec in class EvalFunc<Float>
Parameters:
input - expects a single numeric value
output - returns a single numeric value, the size of an ulp of the argument.
Returns:
result, of type T.
Throws:
IOException

outputSchema

public Schema outputSchema(Schema input)
Overrides:
outputSchema in class EvalFunc<Float>
Parameters:
input - Schema of the input
Returns:
Schema of the output


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