Java: Data Science Made Easy

Using simple Java techniques to find median

In our first example, we will use a basic Java approach to calculate the median. For these examples, we have modified our testData array slightly:

double[] testData = {12.5, 18.3, 11.2, 19.0, 22.1, 14.3, 16.2, 12.5,   17.8, 16.5}; 

First, we use the Arrays class to sort our data because finding the median is simplified when the data is in numeric order:

Arrays.sort(testData); 

We then handle three possibilities:

• Our list is empty
• Our list has an even number of values
• Our list has an odd number of values

The following code could be shortened, but we have been explicit to help clarify the process. If our list has an even number of values, we divide the length of the list by 2. The first variable, ...