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Programming Articles
Page 1142 of 2547
How to sort a vector in R based on manual position of elements?
To sort a vector based on manual position of elements, we can use order function along with the factor function. The factor function will help us to arrange the vector elements in the order we want by defining the levels as vector elements and order function will order them. Check out the below examples to understand how it works.Example1> x1 x1Output[1] 0 1 0 0 1 2 1 2 3 1 2 2 2 4 3 1 4 1 0 1 1 3 3 0 0 4 4 2 4 2 4 2 0 4 0 1 1 [38] 4 ...
Read MoreFind minimum speed to finish all Jobs in C++
In this problem, we are given an array arr[] consisting of n elements and an integer h. Each element of the array arr[] contains the number of pending jobs for the person and H is the time left to complete the jobs (in Hours). Our task is to Find minimum speed to finish all Jobs.Problem Description: We need to find the number of jobs the person needs to complete in one hour in order to complete all the jobs given in the array in H hours. If he can complete all specified at arr[i] in less than an hour, we ...
Read MoreHow to find the number of non-empty values in an R data frame column?
To find the number of non-empty values, we can find the negation of the sum of empty values which is actually the total number of non-empty values. For example, if we have a data frame df that contains a column x which has some empty values then to find the total number of non-empty values we can find the opposite/negation of total empty values. This can be done with the help of sum function and negation operator as shown in the below examples.Example1Consider the below data frame −> x df1 df1Output x 1 1 2 2 3 4 ...
Read MoreFind mirror image of a point in 2-D plane in C++
In this problem, we are given a point P in a 2-D plane and the points a, b, c of the equation ax + by + c = 0. Our task is to find a mirror image of a point in 2-D plane.Let’s take an example to understand the problem, InputP = (2, 1), a = 1, b = -1, c = 0Output(1, 2)ExplanationThe plane looks like, Solution ApproachTo solve the problem, we need to find the equation point P' with coordinates (x', y'). So, we have R, the midpoint where the line form P - P' intersects the mirror ...
Read MoreFind mirror of a given node in Binary tree in C++
In this problem, we are given a binary tree. Our task is to Find mirror of a given node in the Binary tree. We will be given a node, and find the mirror image of that node in the opposite subtree.Let’s take an example to understand the problem, InputOutputmirror of B is E.Solution ApproachOne simple solution to solve the problem is by using the recursion from the root using two pointers for left subtree and right subtree. Then for the target value if any mirror is found return the mirror otherwise recur other nodes.Program to illustrate the working of our ...
Read MoreHow to split a vector by equal and different number of elements in R?
To split a vector by equal and different number of elements, we can use split function along with rep function. The rep function will define the repetition of the divisions for equal as well as different number of elements. For example, if a vector say x contains fifty values then splitting of x with different number of elements as 20, 10, 10, 5, 5 this can be done by using the command split(x, rep(1:5, c(20, 10, 10, 5, 5))).Example1> x1 x1Output [1] 1.30316414 -0.80488291 0.23170812 -0.07318560 -0.73388857 -0.85952329 [7] -0.88713465 -0.26618866 1.45634603 0.31282735 1.39285785 0.32501145 [13] -1.72088389 -0.20699097 -0.37173907 0.03042574 -1.88779297 ...
Read MoreHow to find the inverse of log10 for an R data frame column?
To find the log10 of a data frame column then log10 function will be used but to find the inverse of the log10 can be found by putting 10 raises to the power of the log10 column. For example, if we have a data frame called df that contains a column x then the log10 will be found by usinglog10(df$x)after that the inverse will be found by using 10^(df$x).Example1Consider the below data frame −> x1 x2 df1 df1Output x1 x2 1 66210 2 2 42033 2 3 39309 2 4 80353 3 5 92864 2 6 48621 2 ...
Read MoreFind modular node in a linked list in C++
In this problem, we are given a singly linked list LL and a number k. Our task is to Find modular node in a linked list.Problem Description − we need to find the last node of the linked list for which the index is divisible by k i.e. i % k == 0.Let’s take an example to understand the problem, Inputll = 3 -> 1 -> 9 -> 6 -> 8 -> 2, k = 4Output6ExplanationThe element 6 has index 4, which is divisible by 4.Solution ApproachA simple solution to the problem is by creating a counter to count the ...
Read MoreHow to plot rows of a data frame as lines in R?
To plot row of a data frame as lines, we can use matplot function but we would need to transpose the data frame because transposed values of the data frame will be read as columns and the matplot function plot the columns not rows. For example, if we have a data frame called df then the plot of rows as lines can be created by using the command −matplot(t(df), type="l")Example1Consider the below data frame −> x1 x2 x3 df1 df1Output x1 x2 x3 1 0 9 5 2 3 4 2 3 0 2 1 4 3 7 3 5 ...
Read MoreFind Multiples of 2 or 3 or 5 less than or equal to N in C++
In this problem, we are given a number N. Our task is to Find Multiples of 2 or 3 or 5 less than or equal to N.Problem Description − We will be counting all elements from 1 to N that are divisible by 2 or 3 or 5.Let’s take an example to understand the problem, InputN = 7Output5ExplanationAll the elements from 1 to 7 are : 1, 2, 3, 4, 5, 6, 7. Elements divisible by 2/3/5 are 2, 3, 4, 5, 6Solution ApproachA simple approach to solve the problem is by traversing all numbers from 1 to N and ...
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