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

The SQRT() function is used to calculate the square root of a given expression.
The SQRT function is a built-in function in Excel that is categorized as a Math/Trig Function.
It can be used as a worksheet function (WS) in Excel.

Syntax

grunt> SQRT(expression)

Ensure that 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

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 square root values of the contents of the wikitechy_math.txt file using SQRT() function as given below.

grunt> sqrt_data = foreach math_data generate (data), SQRT(data);

grunt> Dump sqrt_data;

  
(5.0,2.23606797749979) 
(16.0,4.0) 
(9.0,3.0) 
(2.5,1.5811388300841898) 
(5.9,2.4289915799292987) 
(3.1,1.76068165908337)