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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to remove question mark from corrplot in R?
When we have NAs present in the data frame or matrix then correlation matrix contains NA values. Now if we create the correlation matrix plot using corrplot function the Output display question marks.If we want to create the correlation matrix without question marks then we can use the na.label argument and set it to blank as shown in the below Example.ExampleFollowing snippet creates a sample matrix −M
Read MoreHow to create a block diagonal matrix using a matrix in R?
To create a block diagonal matrix using a matrix in R, we can use bdiag function of Matrix package.For Example, if we have a matrix called M and we want to create block diagonal using M 4 times by using the below command −bdiag(replicate(4,M,simplify=FALSE))Check out the Examples given below to understand how it can be done.Example 1Following snippet creates a sample matrix −M1
Read MoreRefactorable number in C++
We are given an integer type value, let's say, number. The task is to check whether the given number is Refactorable or not. If yes print that the number is a refactorable number else print not possible.What is a Refactorable Number?A number is refactorable when it is divisible by its total count of factors available. For example, number 9 is refactorable as it has a total number of factors i.e. 3(1, 3, 9) and 9 is divisible by 3 hence its a refactorable number.Let us see various input output scenarios for this −Input − int number = 9Output − It is a ...
Read MoreRearrange characters in a string such that no two adjacent are same in C++
We are given a string, let's say, str of any given length. The task is to rearrange the given string in such a manner that there won't be the same adjacent characters arranged together in the resultant string.Let us see various input output scenarios for this −Input − string str = "itinn"Output − Rearrangement of characters in a string such that no two adjacent are same is: initn.Explanation − We are given a string type variable let’s say, str. Now we will rearrange the characters of an input string in such a manner that no two same characters occur at the same position ...
Read MoreRectangle with minimum possible difference between the length and the width in C++
Given an area of rectangle as input. The goal is to find the sides of a rectangle such that the difference between the length and breadth is minimum.Area of Rectangle = length * breadth.ExamplesInput − Area = 100Output −Side of Rectangle with minimum difference:Length = 10, Breadth = 10Explanation − Sides with area = 100.2 - 50, 4 - 25, 5 - 20, 10 - 10. Sides with minimum difference are 10-10 with difference = 0. As we know tha square is a rectangle with equal length on all sides.Input − Area = 254Output − Side of Rectangle with minimum difference :Length = 127, Breadth ...
Read MoreHow to create a table with sub totals for every row and column in R?
The sub totals for every row and column are actually called marginal sums. Therefore, we can use addmargins function to our table to get the sub totals for every row and column.For example, if we have table called TABLE then we can add the sub totals by using the command given below −TABLE
Read MoreRecursive program to insert a star between pair of identical characters in C++
Given a string str1 as input. The goal is to insert a ‘*’ between a pair of identical characters in the input string and return the resultant string using a recursive approach.If the input string is str1= "wellness" then output will be "wel*lnes*s"ExamplesInput − str1="happiness"Output − String after adding * : hap*pines*sExplanation − Adding * between pairs pp and ss will gives us resultant string hap*pines*sInput − str1=”swimmmmingggg pooool”Output − String after adding * : swim*m*m*ming*g*g*g po*o*o*olExplanation − Adding * between pairs mm, gg and oo will gives us resultant string swim*m*m*ming*g*g*g po*o*o*olApproach used in the below program is as followsIn this approach take string ...
Read MoreHow to create table of two factor columns in an R data frame?
To create table of two factor columns in an R data frame, we can use table function and with function.For Example, if we have a data frame called df that contains two factor columns say F1 and F2 then we can create table of these two columns by using the below command −with(df,table(F1,F2))Example 1Following snippet creates a sample data frame −Group
Read MoreHow to find the sample size for two sample proportion tests with given power in R?
To find the sample size for two sample proportion tests with given power, we can use the function power.prop.test where we need to at least pass the two proportions and power.By default the significance level will be taken as 0.05 and if we want to change it then sig.level argument will be used.Given below are some examples with the display of significance levels.Example 1Use the code given below to find the sample size for two sample proportion tests −power.prop.test(p1=8/20, p2=6/20, power=0.90, sig.level=0.05)OutputIf you execute the above given snippet, it generates the following Output for the two-sample comparison of proportions power ...
Read MoreRecursive Approach to find nth node from the end in the linked list in C++
Given a Singly linked list and positive integer N as input. The goal is to find the Nth node from the end in the given list using recursion. If the input list has nodes a → b → c → d → e → f and N is 4 then the 4th node from the end will be c.We will first traverse till the last node in the list and while returning from recursion (backtracking) increment count. When count is equal to N then return pointer to current node as result.Let us see various input output scenarios for this −Input − ...
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