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What is TANH() function?

  • Tanh is the hyperbolic tangent function, which is the hyperbolic analogue of the Tan circular function used throughout trigonometry.
  • Tanh[α] is defined as the ratio of the corresponding hyperbolic sine and hyperbolic cosine functions via .
  • Tanh may also be defined as , where is the base of the natural logarithm Log.
 tanh

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TANH() function in Apache Pig

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

Syntax

grunt> TANH(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 
  • We have loaded this file into Pig with a relation named wikitechy_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 hyperbolic tangent values for the contents of the wikitechy_math.txt file using TANH() function as given below.
grunt> tanh_data = foreach math_data generate (data), TANH(data);

Verification

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

Output

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

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