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Programming Articles
Page 1128 of 2547
How to find the sum of non-missing values in an R data frame column?
To find the sum of non-missing values in an R data frame column, we can simply use sum function and set the na.rm to TRUE. For example, if we have a data frame called df that contains a column say x which has some missing values then the sum of the non-missing values can be found by using the command sum(df$x,na.rm=TRUE).Example1Consider the below data frame −x1
Read MoreFind nth Hermite number in C++
In this problem, we are given an integer value N. Our task is to create a program to Find nth Hermite number.Hermite Number is a number is the value of hermite number when there are 0 arguments.Nth hermite Number is HN = (-2) * (N - 1) * H(N-2) The base values are H0 = 1 and H0 = 0.The hermite sequence is − 1, 0, -2, 0, 12, 0, -120, 0, 1680, 0….Let’s take an example to understand the problem, InputN = 7Output0InputN = 6Output-120Solution ApproachA simple solution to the problem is using the formula for hermite number. This ...
Read MoreHow to find the column mean by excluding NA's and if all values are NA then output NA in R data frame?
To find the column mean by excluding NA’s can be easily done by using na,rm but if we want to have NA if all the values are NA then it won’t be that straight forward. Therefore, in such situation, we can use ifelse function and return the output as NA if all the values are NA as shown in the below examples.Example1Consider the below data frame −x1
Read MoreC++ program to find Nth number of the series 1, 6, 15, 28, 45, .....
In this problem, we are given an integer value N. Our task is to create a program to Find Nth number of the series 1, 6, 15, 28, 45, …In the series, every element is 2 less than the mean of the previous and next element.Let’s take an example to understand the problem, InputN = 5Output45Solution ApproachThe Nth term of the series 1, 6, 15, 28, 45, … can be found using the formula, TN = 2*N*N - NProgram to illustrate the working of our solution, Example#include using namespace std; #define mod 1000000009 int calcNthTerm(long n) { return ...
Read MoreFind Nth positive number whose digital root is X in C++
In this problem, we are given two integer values N and X. Our task is to create a program to Find Nth positive number whose digital root is X.Digital Root (X) is a single digit positive number which is found by adding digits of N recursively adding digits, till the sum becomes single digit.Let’s take an example to understand the problem, InputN = 5, X = 4Output40Solution ApproachA simple way to solve the problem is by counting the numbers with a digital root is X. For this, we will start from 1 and then check if the current number’s digital ...
Read MoreFind Nth term (A matrix exponentiation example) in C++
In this problem, we are given an integer N and a recursive function that given Nth term as a function of other terms. Our task is to create a program to Find Nth term (A matrix exponentiation example).The function isT(n) = 2*( T(n-1) ) + 3*( T(n-2) ) Initial values are T(0) = 1 , T(1) = 1Let’s take an example to understand the problem, InputN = 4Output41ExplanationT(4) = 2* (T(3)) + 3*(T(2)) T(4) = 2* ( 2*(T(2)) + 3*(T(1)) ) + 3*( 2* (T(1)) + 3*(T(0)) ) T(4) = 2*( 2*(2* (T(1)) + 3*(T(0))) + 3*(1) ) + ...
Read MoreHow to detect multicollinearity in categorical variables using R?
The multicollinearity is the term is related to numerical variables. It means that independent variables are linearly correlated to each other and they are numerical in nature. The categorical variables are either ordinal or nominal in nature hence we cannot say that they can be linearly correlated.ExampleConsider the below data frame −x
Read MoreC++ program to find Nth term of series 1, 4, 15, 72, 420...
In this problem, we are given an integer N. Our task is to create a program to Find Nth term of series 1, 4, 15, 72, 420…Let’s take an example to understand the problem, InputN = 4Output72Solution ApproachA simple approach to solve the problem is the formula for the Nth term of the series. For this, we need to observe the series and then generalise the Nth term.The series can be seen as the product of factorial and a some variables, 1, 4, 15, 72, 420… 1!*(X1), 2!*(X2), 3!*(X3), 4!*(X4), 5!*(X5)... 1*(1), 2*(2), 6*(5/2), 24*(3), 120*(7/2)...Here, the series of product ...
Read MoreHow to find the object size in R?
To find the object size in R, we can use object.size function. For example, if we have a data frame called df then the size of df can be found by using the command object.size(df). Similarly, if we have a vector say x then it’s size can be found using object.size(x) and for a matrix M it can be object.size(M).Example1Consider the below data frame −x
Read MoreC++ program to find Nth term of the series 0, 2, 4, 8, 12, 18...
In this problem, we are given an integer N. Our task is to create a program to Find Nth term of series 0, 2, 4, 8, 12, 18…Let’s take an example to understand the problem, InputN = 5Output12Solution ApproachA simple approach to solve the problem is the formula for the Nth term of the series. For this, we need to observe the series and then generalise the Nth term.The formula of Nth term isT(N) = ( N + (N - 1)*N ) / 2Program to illustrate the working of our solution, Example#include using namespace std; int calcNthTerm(int N) { ...
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