Apache Pig - ASIN()

The ASIN() function is used to calculate the arc sine value of a given expression.

Syntax

Here is the syntax of the ASIN() function.

grunt> ASIN(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 arc sine values of the contents of the math.txt file using ASIN() function as shown below.

grunt> asin_data = foreach math_data generate (data), ASIN(data);

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

grunt> Dump asin_data;
  
(5.0,NaN) 
(16.0,NaN) 
(9.0,NaN) 
(2.5,NaN) 
(5.9,NaN)  
(3.1,NaN)