Java Multi Dimensional Array Program Trouble

Question

I don't understand why i'm getting these errors when i compile my code.

Error: F:\G\programA: operator * cannot be applied to int,double[]

Error: F:\G\programA: operator - cannot be applied to double,double[]

import java.io.*;

public class programA
{
  public static void main (String [] args) throws IOException
  {
    BufferedReader myInput = new BufferedReader (new InputStreamReader (System.in));

  int points = 100, dimension = 3;

  double [] length;
  length = new double [dimension];

  double [][] loc;
  loc = new double [points][dimension];

   for (int x = 0; x < points; x++){
  for (int y = 0; y < dimension; y++){
   location [x][y]= (Math.random() * (2 *length)) - length;
  }
  }

  }
}

nanofarad · Accepted Answer · 2013-09-17 21:12:18Z

3

2 *length

You're multiplying an array by an int. Not going to happen. The code around that is somewhat unclear, but since you're trying to set a single array element you'll want to get a single element of length, such as by length[0] or length[someIntInRange].

Also, location [x][y] should be loc[x][y] as there is no field called location.

answered Sep 17, 2013 at 21:12

nanofarad

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Comments

phntmasasin · Accepted Answer · 2013-09-17 23:03:53Z

1

Since the code isnt clear, I am assuming you need

loc [x][y]= (Math.random() * (2 *length[y])) - length[y];

Math Operations cannot be done between an array and a number.

edited Sep 17, 2013 at 23:03

answered Sep 17, 2013 at 21:17

phntmasasin

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1 Comment

ajb Over a year ago

more likely he needs length[y], not length[dimension] which will get an out-of-bounds exception

StormeHawke · Accepted Answer · 2013-09-17 21:13:10Z

0

I don't understand why i'm getting these errors when i compile my code.

Error: F:\G\programA: operator * cannot be applied to int,double[]

Error: F:\G\programA: operator - cannot be applied to double,double[]

You are trying to multiply an int and later a double against an array of type double. This is not possible. If you want to multiply against all values in the array, you need to iterate over it to do so.

answered Sep 17, 2013 at 21:13

StormeHawke

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Comments

codethulhu · Accepted Answer · 2013-09-17 21:14:00Z

0

Your problem is an undefined operation here...

double [] length;
length = new double [dimension];
...
(2 *length)

You need to select a value from the length array.

answered Sep 17, 2013 at 21:14

codethulhu

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