pig tutorial - apache pig tutorial - Apache Pig - ACOS() - pig latin - apache pig - pig hadoop




What is Apache Pig - ACOS()?

  • The ACOS() function of Pig Latin is used to calculate the arc cosine value of a given expression.

Syntax :

  • Here is the syntax of the ACOS() function.
grunt> ACOS(expression) 

Example

  • Assume that there is a file named wikitechy_math.txt in the HDFSdirectory /pig_data/. This file contains integer and floating point values as shown below.

wikitechy_math.txt

3 
10 
15 
6.5 
4.9 
7.5
  • And, we have loaded this file into Pig with a relation named wikitechy_math_data as shown below.
grunt> wikitechy_math_data = LOAD 'hdfs://localhost:9000/pig_data/wikitechy_math.txt' USING PigStorage(',')
   as (data:float); 
  • Let us now calculate the arc cosine values of the contents of the wikitechy_math.txt file using ACOS() function as shown below.
grunt> acos_data = foreach wikitechy_math_data generate (data), ACOS(data);
  • The above statement stores the result in the relation named abs_data. Verify the contents of the relation using the Dump operator as shown below.
grunt> Dump acos_data;

Output:

(3.0,NaN) 
(10.0,NaN) 
(15.0,NaN) 
(6.5,NaN) 
(4.9,NaN) 
(7.5,NaN) 

Related Searches to Apache Pig - ACOS()