This can be done by using rep function along with matrix function as shown in the below example. Remove Duplicate rows in R using Dplyr – distinct () function. How to multiply a matrix columns and rows with the same matrix rows and columns in R? How to convert data frame values to a vector by rows in R? repeat loop in R, is similar to while and for loop, it will execute a block of commands repeatedly till break. For example, if we have a matrix that contains only one row and three columns then the replication of that matrix three times will repeat that one row three times. Today I worked on a simulation program which require me to create a matrix by repeating the vector n times (both by row and by col). The R function duplicated() returns a logical vector where TRUE specifies which elements of a vector or data frame are duplicates. The basic syntax for creating a repeat loop in R is −. In the above example repeat loop will sum up the value until it reaches 6. Distinct function in R is used to remove duplicate rows in R using Dplyr package. How to replicate a matrix by rows in R? The latter is what I will show here. duplicated returns a logical vector indicating which rows of a data.table are duplicates of a row with smaller subscripts. The replicate() function is a member of the apply family of functions in base R. Specifically, from the documentation: replicate is a wrapper for the common use of sapply for repeated evaluation of an expression (which will usually involve random number generation). When no by then duplicated rows by all columns are removed. Given the following vector: x <- c(1, 1, 4, 5, 4, 6) To find the position of duplicate elements in x, use this: duplicated(x) ## [1] FALSE TRUE FALSE FALSE TRUE FALSE. break. } The Repeat Function(loop) in R executes a same block of code iteratively until a stop condition is met. unique returns a data.table with duplicated rows removed, by columns specified in by argument. The basic syntax for creating a repeat loop in R is −. How to convert a vector into matrix in R? In this Tutorial we will learn Repeat and Replicate function in R. Repeat and Replicate  are import among the R functions. } repeat loop in R, is similar to while and for loop, it will execute a block of commands repeatedly till break. Even the task is extremely simple and only take 1 line to finish(10sec), I have to think about should the argument in rep be each or times and should the argument in matrix is nrow or ncol. Select random rows from a data frame It’s possible to select either n random rows with the function sample_n () or a random fraction of rows with sample_frac (). Example : # repeat loop in R or repeat function in r sum <- 0 repeat { sum = sum+1 print (sum) if (sum == 6) { print ("repeat loop ends"); break } } This important for users to reproduce the analysis. First thing you should do is load the data.table library. How to convert a matrix into a matrix with single column in R? The replication of matrix by rows means that repeating a matrix one or more times but row-wise. There are other posts that mention repeating individual rows using the value in a numerical column. repeat {. (adsbygoogle = window.adsbygoogle || []).push({}); [1] 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4, Tutorial on Excel Trigonometric Functions, Reshape in R from wide to long and from long to wide, Rowsums ,colsums rowmeans and Columnmeans in R. Do NOT follow this link or you will be banned from the site. library(data.table) Once data.table loads, create a simple data.table with two columns that we will use as a test. How to select a column of a matrix by column name in R? So the output will be. How to multiply a matrix with a vector in R? There are other methods to drop duplicate rows in R one method is duplicated () which identifies and removes duplicate in R. Once it reaches six it prints “repeat loop ends” and breaks the loop, so the output will be, Rep() is the function in R that replicates the values, In the above example 2 is replicated 10 times, In the above example sequence 1 to 4 is replicated until the length reaches 20 elements, Replicate function in R is also used to replicate the list, in the above example list of ratings from 1 to 5 is replicated thrice. In your R console or code add the following. How to create a subset of rows or columns of a matrix in R? How to multiple a matrix rows in R with a vector? For example, if we have a matrix that contains only one row and three columns then the replication of that matrix three times will repeat that one row three times. How to add a new column to a matrix in R. Extract duplicate elements: x[duplicated(x)] ## [1] 1 4 Dplyr package in R is provided with distinct () function which eliminate duplicates rows with single variable or with multiple variable. 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