Apache Pig - EXP()


Advertisements

The EXP() function of Pig Latin is used to get the Euler’s number e raised to the power of x (given expression).

Syntax

Here is the syntax of the EXP() function.

grunt> EXP(expression)

Example

Assume that there is a file named math.txt in the HDFS directory /pig_data/. This file contains integer and floating point values as shown below.

math.txt

5 
16 
9 
2.5 
5.9 
3.1

And, we have loaded this file into Pig with a relation named math_data as shown below.

grunt> math_data = LOAD 'hdfs://localhost:9000/pig_data/math.txt' USING PigStorage(',')
   as (data:float);

Let us now calculate the exp values of the contents of the math.txt file using EXP() function as shown below.

grunt> exp_data = foreach math_data generate (data), EXP(data);

The above statement stores the result in the relation named exp_data. Verify the contents of the relation using the Dump operator as shown below.

grunt> Dump exp_data;
  
(5.0,148.4131591025766) 
(16.0,8886110.520507872) 
(9.0,8103.083927575384) 
(2.5,12.182493960703473) 
(5.9,365.0375026780162) 
(3.1,22.197949164480132) 
apache_pig_math_functions.htm
Advertisements