Apache Pig - SIN()


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The SIN() function of Pig Latin is used to calculate the sine value of a given expression.

Syntax

Here is the syntax of the SIN() function.

grunt> SIN(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);

Now, let’s calculate the sine values of the contents of the math.txt file using SIN() function as shown below.

grunt> sin_data = foreach math_data generate (data), SIN(data);

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

grunt> Dump sin_data;
  
(5.0,-0.9589242746631385) 
(16.0,-0.2879033166650653) 
(9.0,0.4121184852417566) 
(2.5,0.5984721441039564) 
(5.9,-0.3738765763789988) 
(3.1,0.04158075771824354)
apache_pig_math_functions.htm
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