Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Articles on Trending Technologies
Technical articles with clear explanations and examples
How to create a dendrogram without X-axis labels in R?
A dendrogram display the hierarchical relationship between objects and it is created by using hierarchical clustering. In base R, we can use hclust function to create the clusters and the plot function can be used to create the dendrogram. For example, if we want to create the dendrogram for mtcars data without X−axis labels then it can be done as shown below −hc=hclust(dist(mtcars)) plot(hc, xlab="", sub="")Examplehead(mtcars) mpg cyl disp hp drat wt qsec vs am gear carb Mazda RX4 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4 Mazda RX4 Wag 21.0 6 160 110 3.90 2.875 17.02 ...
Read MoreCount the number of words having sum of ASCII values less than and greater than k in C++
We are given a string str with a sentence and a number k. The goal is to find the count of in str that have ascii value less than k and words with ascii value greater than k.ASCII − Unique code as the number assigned to each character in a language.Let us understand with examples.Input − str= “This is ASCII”. k=300Output − Count of the number of words having sum of ASCII values less than k are − 1Count of number of words having sum of ASCII values greater than k are − 2Explanation − word “is” has ascii less ...
Read MoreHow to create a dashed line that passes through Y = 1 in base R?
Usually, plots are created with solid lines but sometimes we need to use dashed line so that the points can represent a threshold or something critical, the main objective here is to get the attention of the reader on these points. In base R, the plots are created with plot function and we can use abline function with lty =2 to draw dashed lines.Example1x
Read MoreCount subarrays with equal number of occurrences of two given elements in C++
We are given an array arr[] of integers. Also, two numbers A and B. The goal is to count all subarrays of arr[] such that occurrences of A and B is equal in all. If the array is [1, 2, 3] and A is 1 and B is 2. Subarrays will be [3], [1, 2], [1, 2, 3].Let us understand with examples.Input − arr[] = { 2, 2, 1, 1, 1, 5 }; A=1, B=5Output − Count of subarrays with equal no. of occurrences of two given elements are − 4Explanation − Subaarays will be − [2], [2], [2, 2], ...
Read MoreHow to multiply a matrix columns and rows with the same matrix rows and columns in R?
To multiply a rows or columns of a matrix, we need to use %*% symbol that perform the multiplication for matrices in R. If we have a matrix M with 5 rows and 5 columns then row 1 of M can be multiplied with column 1 of M using M[1,]%*%M[,1], similarly, we can multiply other rows and columns.ExampleM
Read MoreCount subarrays with all elements greater than K in C++
We are given an array arr[] of integers. Also a number K. The goal is to count all subarrays of arr[] such that all elements of the subarray are greater than K or K is less than all elements of the subarrays. If the array is [1, 2, 3] and K is 1. Subarrays will be [2], [3], [2, 3].Let us understand with examples.Input − arr[] = { 2, 2, 1, 1, 1, 5 }; K=1Output − Count of subarrays with all elements greater than K are − 4Explanation − Subaarays will be: [2], [2], [5], [2, 2]. All elements ...
Read MoreHow to find the row-wise index of non-NA values in a matrix in R?
A matrix can also contain missing values and those missing values can be placed in a matrix by randomization as well, hence we cannot be sure about the positions of those values that are referred to as NA and the non-missing values. If we want to find the positions of the non-missing values in a matrix then apply function can be used where we can use which function to exclude NA values. Check out the below examples to understand how it works.Example1M1
Read MoreCount subarrays with equal number of 1's and 0's in C++
We are given an array arr[] containing 0’s and 1’s only. The goal is to count all subarrays of arr[] such that occurrences of 0s and 1s is equal in all. If the array is [1, 0, 0] .Subarray will be [1, 0] only.Let us understand with examples.Input − arr[] = { 0, 0, 1, 1, 1, 0 };Output − Count of subarrays with an equal number of 1’s and 0’s are − 4Explanation − Subaarays will be −arr[0 to 3] = [0, 0, 1, 1], arr[1 to 2] = [0, 1], arr[4 to 5] =[1, 0], Arr[0 to 5] ...
Read MoreHow to convert 12-hour time scale to 24-hour time in R?
Dealing with time data is not an easy task, it is sometimes difficult even in built-in analytical softwares, thus it won’t be easy in R as well. Mostly, we record time on a 12-hour time scale but in some situations, we need 24-hour time scale. Therefore, if we want to convert 12-hour time scale to 24-hour time scale then format function can be used with as.POSIXct. Look at the below examples, to understand it better.Example1Time1
Read MoreCount Subarrays with Consecutive elements differing by 1 in C++
We are given an array arr[] containing integers. The goal is to count all subarrays of arr[] such that consecutive elements in each subarray differ by 1 only. If the array is [1,2,3] .Subarrays will be [1,2], [2,3], [1,2,3] only.Let us understand with examples.Input − arr[] = { 4,3,2,1 };Output − Count of Subarrays with Consecutive elements differing by 1 is − 6Explanation − Subaarays will be −[4,3], [3,2], [2,1], [4,3,2], [3,2,1], [4,3,2,1]. Total 6.Input − arr[] = { 1,5,6,7,9,11 };Output − Count of Subarrays with Consecutive elements differing by 1 is − 3Explanation − Subaarays will be −[5,6], [6,7], [5,6,7]. Total 3The approach used in the below program is as followsWe will traverse the array using a for a loop. From i=0 to i
Read More