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Articles on Trending Technologies
Technical articles with clear explanations and examples
How to multiply two matrices in R if they contain missing values?
If we want to multiply two matrices if they contain missing values then we first need to convert the missing values to zeros and then the multiplication can be easily done. If we do not do so then the Output of the multiplication will have NAs at all positions.Check out the Examples given below to understand the correct of multiplication if NAs are present in the matrices.Example 1Following snippet creates a sample matrix −M1
Read MoreMerge Sort using Multithreading in C++
We are given an unsorted integer array. The task is to sort the array using merge sort technique implemented via Multi-threadingMerge SortMerge sort is a sorting technique which is based on divide and conquer technique where we divide the array into equal halves and then combine them in a sorted manner.Algorithm to implement merge sort ischeck if there is one element in the list then return the element.Else, Divide the data recursively into two halves until it can’t be divided further.Finally, merge the smaller lists into new lists in sorted order.Multi-ThreadingIn the operating system, Threads are the lightweight process which ...
Read MoreHow to hide outliers in base R boxplot?
To hide outliers in base R boxplot, we can use range argument inside boxplot function but we will have to play with range argument. The range argument can take many values therefore, we would need to find the correct one that removes all the outliers. To understand how it works check out the Example given below −ExampleTo hide outliners in base R boxplot, use the following snippet −x
Read MoreMemorization (1D, 2D and 3D) Dynamic Programming in Java
Memorization is a technique based on dynamic programming which is used to improve the performance of a recursive algorithm by ensuring that the method does not run for the same set of inputs more than once by keeping a record of the results for the provided inputs(stored in an array).Memorization can be achieved by implementing top down approach of the recursive method.Let us understand this scenario with the help of basic Fibonacci example1-D MemorizationWe will be considering a recursive algorithm with only one non constant parameter (only one parameter changes its value) hence this method is called 1-D memorization. The ...
Read MoreHow to remove line numbers from data.table object in R?
To remove line numbers from data.table object in R, we can set row.names to FALSE and print the data.table object.For Example, if we have a data.table object called DT then we can remove line numbers from DT by using the command given below −print(DT,row.names=FALSE)Example 1To load data.table object and create an object use the following snippet to create a data frame −library(data.table) x1
Read MoreFind the value in an R data frame column that exist n times.
To find the value in an R data frame column that exist n times, we first need to tabulate the column with factor then extracting the levels of the column after that reading them with as.numeric.Check out the Examples given below to understand how it can be done.Example 1Following snippet creates a sample data frame −x
Read MoreHow to round matrix values in R?
To round matrix values, we can use round function.For Example, if we have a matrix called M and we want to round the value in M to 2 decimal places by using the below command −M
Read MoreFind array using different XORs of elements in groups of size 4 in Java
We are given with an integer array of size N(size of multiple 4) and we have to perform Xclusive OR operation on the array such that input[1- 4] resembles utility_arr[1- 4] and the conditions of computing is If arr[1 – 4] = {a1, a2, a3, a4} then q[1 – 4] = {a1 ⊕ a2 ⊕ a3, a1 ⊕ a2 ⊕ a4, a1 ⊕ a3 ⊕ a4, a2 ⊕ a3 ⊕ a4}Let us see various input output scenarios for this -In − int[] input = { 5, 2, 3, 4 };Out − Result after XOR operation 4 3 2 5Explanation −An Exclusive-OR gate's output ...
Read MoreHow to display numbers with decimal in R data frame column?
To display numbers with decimal in R data frame column, we can use format function with round function and nsmall argument.For Example, if we have a data frame called df that contains an integer column say X then we can display numbers in X with 2 decimal places by using the below command −df$X
Read MoreChange the decimal point of every value in an R data frame column.
To change the decimal point of every value in an R data frame column, we can use round function.For Example, if we have a data frame called df that contains a column say X and we want to have each value with 3 decimal places then we can use the below command −df$X
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