Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Server Side Programming Articles
Page 1897 of 2109
How to remove line numbers from data.table object in R?
To remove line numbers from data.table object in R, we can set row.names to FALSE and print the data.table object.For Example, if we have a data.table object called DT then we can remove line numbers from DT by using the command given below −print(DT,row.names=FALSE)Example 1To load data.table object and create an object use the following snippet to create a data frame −library(data.table) x1
Read MoreFind the value in an R data frame column that exist n times.
To find the value in an R data frame column that exist n times, we first need to tabulate the column with factor then extracting the levels of the column after that reading them with as.numeric.Check out the Examples given below to understand how it can be done.Example 1Following snippet creates a sample data frame −x
Read MoreHow to round matrix values in R?
To round matrix values, we can use round function.For Example, if we have a matrix called M and we want to round the value in M to 2 decimal places by using the below command −M
Read MoreFind array using different XORs of elements in groups of size 4 in Java
We are given with an integer array of size N(size of multiple 4) and we have to perform Xclusive OR operation on the array such that input[1- 4] resembles utility_arr[1- 4] and the conditions of computing is If arr[1 – 4] = {a1, a2, a3, a4} then q[1 – 4] = {a1 ⊕ a2 ⊕ a3, a1 ⊕ a2 ⊕ a4, a1 ⊕ a3 ⊕ a4, a2 ⊕ a3 ⊕ a4}Let us see various input output scenarios for this -In − int[] input = { 5, 2, 3, 4 };Out − Result after XOR operation 4 3 2 5Explanation −An Exclusive-OR gate's output ...
Read MoreHow to display numbers with decimal in R data frame column?
To display numbers with decimal in R data frame column, we can use format function with round function and nsmall argument.For Example, if we have a data frame called df that contains an integer column say X then we can display numbers in X with 2 decimal places by using the below command −df$X
Read MoreChange the decimal point of every value in an R data frame column.
To change the decimal point of every value in an R data frame column, we can use round function.For Example, if we have a data frame called df that contains a column say X and we want to have each value with 3 decimal places then we can use the below command −df$X
Read MoreWhy Output of mean of normal random variable created using rnorm equals to 10 is not 10 in manual calculation with R?
When we find the mean of normal random variable which is created with rnorm(“sample_size”, 10) is not 10 because rnorm will create a random variable hence mean will be changed but as we increase the sample size the mean will become closer to 10.Check out the Examples given below to understand the variation in the Outputs as the sample size increases.ExampleThe variation in the Outputs of mean of normal random variable created by using rnorm as the sample size increases is explained below −mean(rnorm(100, mean=10)) mean(rnorm(100, mean=10)) mean(rnorm(100, mean=10)) mean(rnorm(100, mean=10)) mean(rnorm(100, mean=10)) mean(rnorm(100, mean=10)) mean(rnorm(100, mean=10)) mean(rnorm(1000, mean=10)) mean(rnorm(1000, ...
Read MoreMeet in the middle in Java
We are provided with an array and a sum value; the problem statement is to calculate the maximum subset sum which does not exceed the given sum value. We cannot apply the brute force approach here because the structure of the given array is not the same as the divide and conquer approach.Let us see various input output scenarios for this -Let us understand with exampleInput − long arr[] = { 21, 1, 2, 45, 9, 8 } long given_Sum = 12Output −The maximum sum subset having sum less than or equal to the given sum-->12Explanation −The array is split into a set ...
Read MoreMaximize the total profit of all the persons X in Java
We are given 5 Integer variables Num, P1, P2, profit_P1, profit_P2 and the task is to maximize the profit and from all the natural numbers in the range of [1, Num]. The approach here is that if a positive number is divisible by P1 the profit increases by profit_P1 and similarly if if the number in the range is divisible by P2 the profit margin of profit_P2 increases. Also, the profit from a positive integer can be added at most once.Let us understand with example:-Input − int num = 4, P1 = 6, P2 = 2, profit_P1 = 8, profit_P2 = ...
Read MoreMerge K sorted linked lists in Java
We are given a K number of linked lists of variable sizes which are sorted in their sequence and we have to merge the list into a resultant list in such a way that the resultant array is sorted in order and the resultant array is printed as the output to the user.Let us understand with example:-Input −int k = 3;list[0] = new Node(11);list[0].next = new Node(15);list[0].next.next = new Node(17);list[1] = new Node(2);list[1].next = new Node(3);list[1].next.next = new Node(26);list[1].next.next.next = new Node(39);list[2] = new Node(4);list[2].next = new Node(8);list[2].next.next = new Node(10);Output −The merged list is-->2>> 3>> 4>> 8>> 10>> 11>> 15>> 17>> ...
Read More