## Ranking Arrays based on an specific element

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I have arrays of users points like this:

```let groupRank = [];

userA = ["Sara", "24"];
userB = ["John", "12"];
userC = ["Eddi", "20"];
userD = ["Marry", "13"];
```

and I want to rank them based on their points and get this:

```Console.log(groupRank);
//Sara, Eddi, Marry, John
```

You can create a 2D array and `sort` it based on the `points` which is at index `1`. Then use to `map` to get the names which are at index `0`

```let array = [
["Sara", "24"],
["John", "12"],
["Eddi", "20"],
["Marry", "13"]
]

const sortedNames = array.sort((a, b) => b[1] - a[1])
.map(a => a[0])

console.log(sortedNames.join())```

Rank of all elements in an array, Given an array of N integers with duplicates allowed. All elements are ranked from 1 to N in ascending order if they are distinct. If there are say x repeated elements of a particular value then each element should be assigned a rank equal to the arithmetic mean of x consecutive ranks. Given an array of N integers with duplicates allowed. All elements are ranked from 1 to N in ascending order if they are distinct. If there are say x repeated elements of a particular value then each element should be assigned a rank equal to the arithmetic mean of x consecutive ranks.

1. First group all array in one array.
2. Then apply sorting based one `1` index
3. create the array only with name using `Array#map`

```let groupRank = [];

userA = ["Sara", "24"];
userB = ["John", "12"];
userC = ["Eddi", "20"];
userD = ["Marry", "13"];
var res = [userA,userB,userC,userD]; //group all in one
res = res.sort((a,b)=> b[1]-a[1]); // sort based on point
res = res.map(a=> a[0]); //map the names only
console.log(res)```

Replace each element of an array by its corresponding rank, Given an array of distinct integers, replace each element of the array by its corresponding rank in the array The minimum element in the array has rank 1, the� Use argsort twice, first to obtain the order of the array, then to obtain ranking: array = numpy.array( [4,2,7,1]) order = array.argsort() ranks = order.argsort() When dealing with 2D (or higher dimensional) arrays, be sure to pass an axis argument to argsort to order over the correct axis. share.

You can use `sort` function and put all the users inside an array. Then use sort function and while sorting convert the pointer to a number using unary operator. `sort` will give an array of arrays. If you need the name then use `map` function to get the array of name

```let groupRank = [];

let userA = ["Sara", "24"];
let userB = ["John", "12"];
let userC = ["Eddi", "20"];
let userD = ["Marry", "13"];

let allUsers = [userA, userB, userC, userD];

groupRank = allUsers.sort(function(a, b) {
return +b[1] - (+a[1])
}).map(item => item[0])

console.log(groupRank)```

[PDF] Sorting, Ranking, Indexing, Selecting, vr is the ranked array, and vs is the sorted array, then indexing vi gives vr. In Matlab we can sort and Selection is the problem of finding the mth largest element in v. For instance, to find Complexity: The number of operations required to calculate a given quantity (e.g. a sorted list) In Octave these are built-in: ## a is the� Arrays have their first element stored at the zeroth index. Also, you can see that if we use -ve index, then it gives us elements from the tail end. The output is: 1st array element is 0 at index 0. 2nd array element is 1 at index 1. Last array element is 9 at index 9. Second array element from the tail end is 8. Slicing arrays

Rank Transform of Array (via Leetcode), Problem statement: Given an array of integers arr , replace each element with its rank. The rank represents how large the element is in the array. Using array.splice(): The array.splice() method is usually used to add or remove items from an array. This method takes in 3 parameters, the index where the element id is to be inserted or removed, the number of items to be deleted and the new items which are to be inserted.

Sorting Arrays - Manual, Command Line Specific Extensions � Compression and Archive Extensions PHP has several functions that deal with sorting arrays, and this document Some sort based on the array keys, whereas others by the values: \$array['key'] = ' value'; Tags each array element with its original position in the array so that when� JavaScript : find an object in array based on object's property (and learn about the "find" function) Published on March 20, 2017 March 20, 2017 • 319 Likes • 48 Comments Report this post

This is assignment initialization. The indexes are in the square brackets. Number 1 is going to be the first element of the array, 2 the second. for (int i = 0; i < array.Length; i++) { Console.WriteLine(array[i]); } We go through the array and print its elements. An array has a Length property, which gives the number of elements in the array. Since arrays are zero based, the indexes are 0..length-1.