Get specific element from array in Java

Question

Basically I am trying to return an element from an 2d array in java. I have created a separate Matrix class and inside the class I want to write a get_element method which would take as input the coordinates of the element I want from the matrix and the matrix itself, however I am not sure how to do this.

public static double get_element(Matrix A, double m , double n)
{  
    for(int i=0;i<A.rows;i++)
        for(int j=0;j<A.cols;j++)
           return A.data[m][n];


}

This is how my code look right now. And I get an error that says lossy conversion between double and int.

Why are you passing/expecting indexes as doubles? They should be int. — Federico klez Culloca
– Federico klez Culloca, Commented Mar 18, 2019 at 17:33
The indices of an array are integers, not doubles. Use the appropriate type. — JB Nizet
– JB Nizet, Commented Mar 18, 2019 at 17:34
You should never use doubles as indexes for arrays, pass in integers instead. You can't access position [0.5]. The compiler is likely complaining because it needs to convert them to integers in order to use them as the index. — Patrick
– Patrick, Commented Mar 18, 2019 at 17:34
As an aside: follow naming conventions: the method should be named getElement, and the matrix should be named a (or, even better, a more descriptive name) — Federico klez Culloca
– Federico klez Culloca, Commented Mar 18, 2019 at 17:41

Federico klez Culloca · Accepted Answer · 2019-03-18 17:39:36Z

3

You don't need the loop. Also, you need to convert the double to int

return A.data[(int) m][(int) n];

Alternatively (better), you change the method signature:

public static double get_element(Matrix A, int m , int n) {  
    return A.data[m][n];
}

edited Mar 18, 2019 at 17:39

Federico klez Culloca

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answered Mar 18, 2019 at 17:32

MWB

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