Apache Pig - TANH()


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

Syntax

Here is the syntax of the TANH() function.

grunt> TANH(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 hyperbolic tangent values for the contents of the math.txt file using TANH() function as shown below.

grunt> tanh_data = foreach math_data generate (data), TANH(data);

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

grunt> Dump tanh_data;
  
(5.0,0.9999092042625951) 
(16.0,0.9999999999999747) 
(9.0,0.999999969540041) 
(2.5,0.9866142981514303) 
(5.9,0.9999849909996685) 
(3.1,0.9959493584508665)
apache_pig_math_functions.htm
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