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What is SIN() function?

  • The sine function is one of the basic functions encountered in trigonometry (the others being the cosecant, cosine, cotangent, secant, and tangent).
  • Let be an angle measured counterclockwise from the x-axis along an arc of the unit circle.
 sin function in apache pig

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SIN() function in Apache Pig

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

Syntax

grunt> SIN(expression)

Example

  • Ensure that we have a file named wikitechy_math.txt in the HDFS directory /pig_data/. This file contains integer and floating point values as given below.

Wikitechy_math.txt

5 
16 
9 
2.5 
5.9 
3.1
  • You have loaded this file into Pig with a relation named math_data as given below.
grunt> math_data = LOAD 'hdfs://localhost:9000/pig_data/wikitechy_math.txt' USING PigStorage(',')
   as (data:float);
  • Now, you can generate the sine values of the contents of the wikitechy_math.txt file using SIN() function as given below.
grunt> sin_data = foreach math_data generate (data), SIN(data);

Verification

Verify the contents of the relation using the Dump operator as shown below.

grunt> Dump sin_data;

Output

  • The above statement stores the result in the relation named 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)

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