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Articles on Trending Technologies
Technical articles with clear explanations and examples
Program to count number of queries that are true in a graph with weighted path in C++
Suppose we have an edge list for an undirected graph where each edge has [u, v, w] fields, u and v are source and destination vertices and w is the weight. And also have a list of queries of the same form [u, v, w]. That represents the question of does there exist a path between u and v such that each edge in the path have weight of at most w. So find the number of queries that are true.So, if the input is like edges = [[0, 1, 6], [1, 2, 7], [2, 3, 8], [0, 3, 5]] ...
Read MoreHow to generate standard normal random numbers in R?
A standard normal distribution is the type of distribution that has mean equals to zero with standard deviation 1. If we want to generate standard normal random numbers then rnorm function of R can be used but need to pass the mean = 0 and standard deviation = 1 inside this function.Examplernorm(10, 0, 1)Output[1] 0.6936607 -0.7967657 -2.7544428 0.2688767 0.5278463 -1.5387568 [7] 1.1716632 -1.5033895 0.8112929 -1.0101065Examplernorm(50, 0, 1)Output[1] 2.58246666 -0.53083341 -0.57343343 1.08172756 1.30341849 -0.07440422 [7] -0.41869305 -0.96227706 -0.46899119 1.55428279 0.09162738 -0.96027221 [13] -0.84735327 -1.74949782 0.58541758 0.23117630 0.47402479 -0.72453853 [19] 0.07171564 1.13088794 0.18735157 0.25091758 -1.34728315 -0.39768159 [25] -0.38109955 -0.34019286 -1.51778561 -0.92222239 -1.22798041 ...
Read MoreHow to perform one-way anova with unequal sample sizes in R?
To perform the one-way anova with sample sizes having different sizes we can use aov function. Suppose we have a categorical column defined as Group with four categories and a continuous variable Response both stored in a data frame called df then the one-way anova can be performed as −aov(Response~Group,data=df)ExampleConsider the below data frame −Group
Read MoreProgram to find minimum number of pins required to hang all banners in C++
Suppose we have a list of intervals of the form [start, end] this is representing the starts and end points of banners we want to hang. At least one pin is required to hang a banner, and one pin can hang more than once banners. We have to find the smallest number of pins required to hang all the banners.So, if the input is like intervals = [[2, 5], [5, 6], [8, 10], [10, 13]], then the output will be 2, as we can put two pins at position 5 and 10 to hang all of the banners.To solve this, ...
Read MoreFirst digit in factorial of a number in C++
In this tutorial, we are going to write a program the finds the first digit of a factorial. Let's see an example.Input − 7Output − 5Let's see the steps to solve the problem.Initialize the numberFind the factorial of the number.Divide the number until it becomes a single digit.ExampleLet's see the code.#include using namespace std; void findFirstDigitOfFactorial(int n) { long long int fact = 1; for (int i = 2; i = 10) { fact = fact / 10; } cout
Read MoreHow to convert multiple columns in an R data frame into a single numerical column along with a column having column names as factor?
When we receive data from any source, it is highly likely that it would not be a perfect data set for the intended analysis, therefore, we need to perform some cleaning or mining based on the characteristics of the data. For example, if we have a column name of a data frame as factor levels of a numerical variable then we might want to convert that data frame in such a way that numerical values are stored in a single column and the column names are stored in another column that will represent a factor so that we can apply ...
Read MoreHow to convert a time series object to a vector in R?
To convert a time series object into a vector, we just need to read that object with as.numeric and store it in some other object or in the same object. For example if we have a time series object x then it can be converted to a vector by using x
Read MoreFirst N natural can be divided into two sets with given difference and co-prime sums in C++
In this tutorial, we have to find whether the natural numbers from 1 to n is divided into two halves or not. It has to satisfy the following conditions.The absolute difference between the two series sum should be m.And the GCD of two sums should be 1 i.e.., co-primes.The sum of first n natural numbers is (n*(n+1))/2. We can find the sumOne and sumTwo as we have total sum and difference m. See the below equations.sumOne + sumTwo = (n*(n+1))/2 sumOne - sumTwo = mExampleCheck whether the absolute sum is equal to m or not. And then check for GCD.#include ...
Read MoreHow to create a scatterplot with regression line using ggplot2 with 0 intercept and slope equals to 1 in R?
To create a regression line with 0 intercept and slope equals to 1 using ggplot2, we can use geom_abline function but we need to pass the appropriate limits for the x axis and y axis values. For example, if we have two columns x and y in a data frame df and both have ranges starting from -1 to 1 then the scatterplot with regression line with 0 intercept and slope equals to 1 can be created as −ggplot(df,aes(x,y))+geom_point()+geom_abline()+lims(x=c(-1,1),y=c(-1,1))ExampleConsider the below data frame −x
Read MoreProgram to find all possible IP address after restoration in C++
Suppose we have a string with only digits, we have to restore it by forming all possible valid IP address combinations. We know that a valid IP address consists of exactly four integers (each integer is in range 0 to 255) separated by single period symbol.So, if the input is like ip = "25525511136", then the output will be ["254.25.40.123", "254.254.0.123"]To solve this, we will follow these steps −Define a function convertToNum(), this will take s, start, end, num := 0for initialize i := start, when i 255, then −return 10000return numDefine a function addDots(), this will take positions, ...
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