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What is EXP() function?
- The exponential function, exp(x), calculates the value of e to the power of x, where e is the base of the natural logarithm, 2.718281828... .
- You can enter the command exp using either the 1-D or 2-D calling sequence.
- For example, exp(-1) is equivalent to . ... exp(1) is used instead.
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EXP() function in Apache Pig
- The EXP() function of Pig Latin is used to get the Euler’s number e raised to the power of x for given expression.
Syntax:
grunt> EXP(expression)
Example:
- Ensure that we have a file named wikitechy_exp.txt in the HDFS directory /pig_data/.
- This file contains integer and floating point values as shown below.
Wikitechy_exp.txt
5
16
9
2.5
5.9
3.1
- You have loaded this file into Pig with a relation named exp_data as given below.
grunt> exp_data = LOAD 'hdfs://localhost:9000/pig_data/wikitechy_exp.txt' USING PigStorage(',')
as (data:float);
- You compute the exp values of the contents of the wikitechy_exp.txt file using EXP() function as given below.
grunt> exp_data = foreach math_data generate (data), EXP(data);
The above statement stores the result in the relation named exp_data.
Verification:
- Now you can verify the contents of the relation using the Dump operator as given below.
grunt> Dump exp_data;
Output:
The output shows that the result in the file>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)