Databases
StackOverflow2013
Postsdbo
POHow Can I Display a N x N Matrix of Random Numbers in Java?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POHow Can I Display a N x N Matrix of Random Numbers in Java?
    primarykey
    data
    text
    <p>I'm trying to create a matrix of random double numbers. The matrix must be of size n x n and all numbers must be between 1 and 100. I've been trying to sort it out for ages now and I know it must be something so simple (as it usually is).</p> <p>Here is my code:</p> <pre><code>public static void main(String[] args) { PrintRandomGraph(RandomArray(4)); } private static double[] RandomArray(int n) { double[] randomArray = new double[n]; double[][] randomMatrix = new double [n][n]; Random rand = new Random(); rand.setSeed(System.currentTimeMillis()); for (int i = 0; i &lt; n; i++) { Integer r = rand.nextInt()% 100; randomArray[i] = Math.abs(r); for (int j = 0; j &lt; n; j++) { Arrays.fill(randomMatrix, i, i+1, randomArray); } } return randomArray; } private static void PrintRandomGraph(double[] inputArray) { int n = inputArray.length; double[] showArray = new double[n]; double[][] showMatrix = new double [n][n]; for (int j = 0; j &lt; n; j++) { for (int i = 0; i &lt; n; i++) { double r = inputArray[i]; showArray[i] = r; Arrays.fill(showMatrix, i, i+1, showArray); } } System.out.println(Arrays.deepToString(showMatrix)); } </code></pre> <p>When I run the code I get a random array repeated n times like : </p> <blockquote> <p>[[63.0, 97.0, 64.0, 75.0], [63.0, 97.0, 64.0, 75.0], [63.0, 97.0, 64.0, 75.0], [63.0, 97.0, 64.0, 75.0]]</p> </blockquote> <p>I think I need to go back to the top of the for loop and add the new array...? Please help =(</p> <p>Any help is much appreciated. Thank you.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USTamara JQ
    1. USTamara JQ
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POHow Can I Display a N x N Matrix of Random Numbers in Java?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POHow Can I Display a N x N Matrix of Random Numbers in Java?
      1. USksindi
      1. VTFavorite
    1. COcould you reformat your printRandomGraph() function?
      singulars
      1. POHow Can I Display a N x N Matrix of Random Numbers in Java?
      1. USEternal Noob
    2. COYeah I'm not sure. I was messing about with this earlier but I kept just printing out the same four numbers in different orders or with blanks in places?
      singulars
      1. POHow Can I Display a N x N Matrix of Random Numbers in Java?
      1. USTamara JQ
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload