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