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Page 6 of 2108
How to concatenate two or more vectors in R?
The concatenation of vectors can be done by using combination function c. For example, if we have three vectors x, y, z then the concatenation of these vectors can be done as c(x,y,z). Also, we can concatenate different types of vectors at the same time using the same same function.Example1set.seed(999) x1
Read MoreWhat is the difference between creating a matrix by using matrix function or as.matrix function in R?
The difference between as.matrix and matrix function is that nrow argument or ncol argument are not helpful with as.matrix function but with matrix function we can use them. Therefore, we can actual define a matrix with matrix function but if we have a data frame or data table then it can be converted to matrix by using as.matrix function.Examples of creating matrix with as.matrix and matrix functionExample1M
Read MoreHow to calculate mahalanobis distance in R?
The Mahalanobis distance is the relative distance between two cases and the centroid, where centroid can be thought of as an overall mean for multivariate data. We can say that the centroid is the multivariate equivalent of mean. If the mahalanobis distance is zero that means both the cases are very same and positive value of mahalanobis distance represents that the distance between the two variables is large. In R, we can use mahalanobis function to find the malanobis distance.Example1y1
Read MoreMaximum Sum Increasing Subsequence using DP in C++ program
In this problem, we are given an array arr[] of size n. Our task is to create a program to find the maximum Sum Increasing Subsequence using DP in C++.Problem Description − To find the maximum sum increasing subsequence, we will be creating a subsequence in which the next element is greater than the current element.Let’s take an example to understand the problem, Inputarr[] = {4, 2, 3, 6, 5, 9}Output20ExplanationIncreasing subsequence with maximum sum: {2, 3, 6, 9} = 2 + 3 + 6 + 9 = 20Solution ApproachTo solve the problem using a dynamic Program Approach. We will ...
Read MoreHow to check if a matrix is invertible or not in R?
If the matrix is singular then it is not invertible and if it is non−singular then it is invertible. Therefore, we can check if a matrix is singular or not. We can use is.singular.matrix function of matrixcalc for this purpose. For example, if we have a matrix called M then to check whether it is invertible or not, we can use is.singular.matrix(M).Example1Loading matrixcalc package and creating a matrix −library(matrixcalc) M1
Read MoreHow to print a large number of values in R without index?
Whenever we print any vector then the left-hand side of the R window shows indexing, even if we have one value in the vector the index will be there. For example, if we print a vector that has value equal to 2 then the print output will be [1] 2, here [1] represents the index. If we want to print the vector without index then cat function can be used as shown in the below examples.Example1x1
Read MoreHow to change the repeated row names and column names to a sequence in a matrix in R?
To change the repeated row names and column names to a sequence, we first need to read those names in a vector then set them to row names and column names with make.unique function. For example, if a matrix has row names defined as A, B, A, B, A then it can be converted into A, B, A.1, B.1, A.2.Example1M1
Read MoreFind maximum possible stolen value from houses in C++
In this problem, we are given n houses with some values in them. Our task is to Find the maximum possible stolen value from houses.Problem Description − We have an array houses[] that consist of the values that are in each house. A thief robs the houses but he cannot steal from two adjacent houses as neighbours know about the theft. We need to find the maximum possible value that can be stolen by the thief from the house without getting caught.Let’s take an example to understand the problem, Inputhouses[] = {5, 2, 1, 6, 7, 9, 4, 3}Output23ExplanationThe max ...
Read MoreFind Maximum XOR value of a sub-array of size k in C++
In this problem, we are given an array arr[] consisting of n elements and an integer k. Our task is to find the Maximum XOR value of a sub-array of size k.Let’s take an example to understand the problem, Inputarr[] = {3, 1, 6, 2 ,7, 9} k = 3Output12ExplanationAll subarray and the xor of all element of size k, {3, 1, 6} = 4 {1, 6, 2} = 5 {6, 2, 7} = 3 {2, 7, 9} = 12Solution ApproachA simple solution to the problem is by using two loops. One to iterate over the array and other to ...
Read MoreFind maximum value of Sum( i*arr[i]) with only rotations on given array allowed in C++
In this problem, we are given an array arr[] consisting of n elements. We need to Find maximum value of Sum( i*arr[i]) with only rotations on a given array allowed. For find the maximum sum of (i*arr[i]), we can perform any number of rotations.Let’s take an example to understand the problem, Inputarr[] = {4, 1, 3, 7, 2}Output43ExplanationWe will rotate the array once to get the maximum value, After rotation array will be {2, 4, 1, 3, 7}Sum = 0*2 + 1*4 + 2*1 + 3*3 + 4*7 = 0 + 4 + 2 + 9 + 28 = 43Solution ...
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