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Articles on Trending Technologies
Technical articles with clear explanations and examples
Elements of an array that are not divisible by any element of another array in C++
In this problem, we are given two arrays arr1[] and arr2[]. Our task is to create a program to find the elements of an array that are not divisible by any element of another array. Problem Description: Here, we need to find all elements from arr1 that are not divisible by any elements of arr2.Let’s take an example to understand the problem, Input: arr1[] = {17, 15, 5, 12, 8} arr2[] = {5, 4}Output: 17Explanation −Elements of arr1 and elements dividing them, 17 -> no element can divide it.15 -> 5 divides the element.5 -> 5 divides the element.12 -> 4 ...
Read MoreHow to create a plot title with unicode characters using ggplot2 in R?
If we want to use unicode characters in the title for a plot created with the help of ggplot2 package then the ggtitle function will be used combined with functions called expression and paste. Using the expression and paste functions, we can write unicode characters for the title of the plot. Check out the below examples to understand how it works.ExampleConsider the below data frame −> x y df dfOutput x y 1 3.4501307 6.354644 2 2.1561511 5.349282 3 4.5018653 6.080046 4 2.5512959 5.957558 5 3.6818738 5.749713 6 ...
Read MoreElements to be added so that all elements of a range are present in array in C++
In this problem, we are given an array arr[] consisting of n number. Our task is to create a program to find the number of elements to be added so that all elements of a range are present in array. Problem Description: Here, we need to find the number of elements that are needed to be added to the array to make sure that all elements of a range are present in the array. The range is from smallestElement of array to largestElement of array. Let’s take an example to understand the problem, Input: arr[] = {5, 8, 3, 1, 6, 2}Output: 2Explanation:The range is from ...
Read MoreWhat are levels in a column of a data frame in R?
Most people get confused about levels and characters in R, especially the newbies. The difference is that levels specifically define the factor levels of a factor column and the characters are simple the character column that is not a factor or is not used as a factor but can be converted to a factor.ExampleConsider the below data frame −> x1 x2 df1 df1Outputx1 x2 1 B B 2 B A 3 D D 4 D C 5 C A 6 D C 7 A D 8 D B 9 D C 10 B B 11 C B 12 D A ...
Read MoreElo Rating Algorithm in C++
Elo Rating Algorithm is a rating algorithm used to rank players in competitive games. The ranking of player of the competition is based on ranting which changes based on the performance of the player as follows, For a game between two players of different ratings. Let’s say there are two players competing against each other−Player1 Player2Rating of player1 is greater than player2.If player1 wins the game some player will be transferred from player1 to player2 and vice versa if player2 wins.But the amount of rating to be transferred for victory ...
Read MoreProgram to find a triplet nums[i] < nums[k] < nums[j] from a list nums in C++
Suppose we have a list of numbers called nums, we have to check whether there are triplets (i, j, k) such that i < j < k and nums[i] < nums[k] < nums[j].So, if the input is like nums = [2, 12, 1, 4, 4], then the output will be True, as [2, 12, 4] matches the criteria because 2 < 4 < 12.To solve this, we will follow these steps −n := size of numsDefine an array left of size nleft[0] := nums[0]for initialize i := 1, when i < n, update (increase i by 1), do −left[i] := ...
Read MoreWhat is the difference between ls() command and objects() command in R?
They are actually no difference between the two commands as they give the same result that is the number of objects in the current workspace. If we have five different type of objects say a data frame, a matrix, a list, a data.table object, and a vector then both the commands will give the names of these objects.ExampleConsider the below objects −> x1 x2 df1 df1Outputx1 x2 1 A A 2 D A 3 C D 4 A A 5 B C 6 B D 7 D D 8 D C 9 B D 10 B A 11 D B ...
Read MoreEmirp numbers in C++
Emirp number is a special type of number that is a prime number whose digits when reversed create another prime number (this prime number is different from the original one).Emirp is the reverse of prime. Some prime numbers that are not emirp are palindromic prime and single digit prime numbers. Some Emirp Numbers are 13, 17, 37, 733.Program to print all emirp numbers less than n.Here, we are given a number n, and we need to print all emirp numbers less than or equal to n.Let’s take an example to understand the problem, Input: n = 40Output: 13, 17, 31, 37Solution ApproachTo find all emirp numbers less ...
Read MoreProgram to find smallest difference between picked elements from different lists in C++
Suppose we have a list of lists, we have to find the smallest difference that can be formed by picking one value from each of the lists and taking the difference between the maximum and the minimum number of the picked element.So, if the input is like lists = [ [30, 50, 90], [85], [35, 70]], then the output will be 20, as we can take 90, 85, 70 and 90 - 70 = 20To solve this, we will follow these steps −maxVal := -infret := infdefine a priority queue pqn := size of listsfor initialize i := 0, when ...
Read MoreHow to detach a package in R?
To detach a package in R, we can simply use the detach function. But we need to remember that once the package will be detached there is no way to use any of the functions of that particular package. We make this mistake if we forget about detachment. For example, if we detach ggplot2 package using detach function detach(package:ggplot2, unload=TRUE) and again run the ggplot or qplot function then there will be an error.ExampleConsider the below data frame −> x y df dfOutputx y 1 -0.09124881 0.8106691 2 -0.20521435 -1.0067072 3 -1.07904498 1.3867400 4 1.34461945 -1.4676405 5 -0.21731862 0.5801624 6 ...
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