ArrayList<ArrayList<Double>
how to sum an arraylist of and arraylist the += does not work marks an error.
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ArrayList<ArrayList<Double>
how to sum an arraylist of and arraylist the += does not work marks an error.
I am looking to sort an arraylist of arraylist of doubles and I require help?
I was informed that I need to implement comparator or comparable and then use the collection.sort to sort the list of list in order...
ArrayList<ArrayList> list = new ArrayList<ArrayList>()
If you look at the list of list as the following example:
c1-5.0,4.5,10.3,3.5
c2-2.5,1.0,7.8,8.6
c3-6.0,5.6,9.6,9.5
It show go to this
c1-2.5,1.0,7.8,3.5
c2-5.0,4.5,7.8,8.6
c3-6.0,5.6,10.3,9.5
Check 4th element of an arraylist and compare it to an element.
example:
1,1,2,4,1,2,3,4,1,2,5,1.
so the 4th elements would be 4,4,1 and i want to compare that those numbers are the same as 4.
I was thinking an if statemet would work. any recomendations?
How do I compare 3 Arraylist with each other and find the small, medium and large elements. I was thinking something like this but its not working.
ArrayList<interger> a = new ArrayList<ArrayList<interger> >();
a.add(1);
a.add(2);
a.add(7);
ArrayList<interger> b =new ArrayList<ArrayList<interger> >();
b.add(8);
b.add(9);
b.add(1);
ArrayList<interger> c = new ArrayList<ArrayList<interger> >();
c.add(5);
c.add(9)
c.add(8)
for (int i = 0; i < ; i++)
{
for (int j = 0; j < ; j++)
{
for (int k = 0; k < ; k++)
{
if () {}
if () {}
if () {}
}
}}
output:
small =1,2,1
medium = 5,9,7
large = 8,9,8
I would like to calculate the distance in 4d I have 2 arraylist that have all of my elements in it. How do make the formula i have this but its not calculating correctly the distance. List has diferent coordinates every time and t always has the same coordinates.
double w = 0.0;
for (int i = 0; i < List.size(); i++)
{
for (int j = 0; j < List.get(i).size(); j++)
{
w = Math.sqrt(Math.pow(List.get(i).get(j) - t.get(j), 2)+Math.pow(List.get(i).get(j) - t.get(j), 2)+Math.pow(List.get(i).get(j) - t.get(j), 2)+Math.pow(List.get(i).get(j) - t.get(j), 2));
}
System.out.println(w);
I have an ArrayList of 750 elements I would like to divide that ArrayList into 150 subarraylists so 5 elements to each subarraylist.
I have this code but it not working
while (scanner.hasNextLine()) {
String t = scanner.nextLine();
String[] ar = t.split(",");
for (int i = 0; i < ar.length; i++)
{
add.add(Double.parseDouble(ar[i]));
}
I have an array list that looks like this.
8.1,6.5,4.4,3.2,1,8.9,5,1.4,0.1,1,8.7,6.2,4.3,3.2,3
I would like that my program selects every 5 numbers randomly.
for example to select
8.1,6.5,4.4,3.2,1,8.7,6.2,4.3,3.2,3
as you can see it selected 5 numbers from the begging and 5 more from the end
and saves them
Random random_method = new Random();
// loop for generation random number
for (int i = 0; i < array.size(); i++)
// generating random index with the help of
// nextInt() method
int index = random_method.nextInt(array.size());
System.out.println("Random Element is :" + array.get(index));