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