Apache Pig - TAN()


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The TAN() function is used to calculate the trigonometric tangent of a given expression (angle).

Syntax

Here is the syntax of the TAN() function.

grunt> TAN(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);

Let us now calculate the tan values of the contents of the math.txt file using TAN() function as shown below.

grunt> tan_data = foreach math_data generate (data), TAN(data);

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

grunt> Dump tan_data;
 
(5.0,-3.380515006246586) 
(16.0,0.3006322420239034) 
(9.0,-0.45231565944180985) 
(2.5,-0.7470222972386603) 
(5.9,-0.4031107890087444) 
(3.1,-0.041616750118239246)
apache_pig_math_functions.htm
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