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What is TAN() function?

  • Tangent (tan) function is a Trigonometry function.
  • In a right triangle, the tangent of an angle is the length of the opposite side divided by the length of the adjacent side.
  • Sine, Cosine and Tangent are the main functions used in Trigonometry and are based on a Right-Angled Triangle.
  • Before getting stuck into the functions, it helps to give a name to each side of a right triangle: "Opposite" is opposite to the angle θ "Adjacent" is adjacent (next to) to the angle θ.

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TAN() function in Apache Pig

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


grunt> TAN(expression)
  • 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.


  • We 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 tan values of the contents of the wikitechy_math.txt file using TAN() function as given below.
grunt> tan_data = foreach math_data generate (data), TAN(data);


  • Verify the contents of the relation using the Dump operator as given below.
grunt> Dump tan_data;


  • The above statement stores the result in the relation named tan_data.

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