Repeat row vector r Share. #replicate each row 3 times . 2. Generate a repeating sequence based on vector. each. Syntax: rep(vec, n) Data frame indexing is used to append the generated rows to the original data frame rows and stored as the modified data frame. df <- data. tab) [1] 3 1 But how to add those values to my data. repeat list in to a data frame in R. We told R to break the repeat-loop once x had reached a value of 10 or greater. R dplyr repeat dataframe rows by group. For example, on the first iteration, index = valArray (:,1) . frame within a dplyr pipe (though, ceci n'est pas un pipe): Apr 26, 2024 · Feel free to replace the first argument in the repmat() function with any vector of values that you would like to be repeated. Ask Question Asked 2 years, Repeat rows in a data frame according to a vector. This is important to keep Hope someone can help with this problem in R. 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. Usage repmat(x, m, n) Arguments. Table 1 (7500+ rows by 665 Columns each row is unique) num_Hrs Column A Column B . The article will consist of these contents: Sep 29, 2022 · You can use the following methods to replicate rows in a data frame in R using functions from the dplyr package: Method 1: Replicate Each Row the Same Number of Times. Replicate rows of a matrix in R. 5952808 9 4 1. a 2D array m*n to store your matrix), in case you don't know m how many rows you will append and don't care about the computational cost Stephen Simmons mentioned (namely re-building the array at each append), you can squeeze to 0 the dimension to which you want to append to: X = np. x: vector to repeat. Print first five multiples of 3 using repeat loop. The format of the tables is as below. Repeat a vector on a dataframe. Related. Repeat a vector by row Description. Nov 10, 2018 · To create an empty multidimensional array in NumPy (e. Thanks. R's vectorization allows you to do neet things like get the last four elements of x by doing x[length(x)-0:3]. What if you want to replicate each row a different number of times? You can achieve this by creating a vector that specifies the number of times to replicate each row. Jul 19, 2016 · Repeat rows based on vector. A B C ntimes 1 j i 100 2 2 K P 101 4 3 Z Z 102 1 Repeat a vector Description. frame the number of times specified in a column. For example, if I have a vector v = [10 20 30 40 50], I want every row of my matrix to be that vector, but with a random number added to every element of the vector to add some fluctuations. 3295078 12 5 0. length. vec_rep_each() repeats each element of a vector a set number of times. You might have numerics in one column and characters in the next. Jan 4, 2016 · c=r' cc=c(:,ones(N,1)); r_tiled = cc(:)'; This method has significant time savings against reshape or repmat for large N's. Also a side note: Whenever you use R A data. Repeat matrix object respectively to its shape and orientation Usage crep(x, times) rrep(x, times) Arguments. Using rep() function in a for loop? 0. for row-vectors a and b I can create A which has A(:,n,m,k)=a for all n , m , k and similarly B which has B(n,:,m,k) for all n , m , k as follows: matrix replicated over ncol(mx) * n columns and nrow(mx) * n rows Note. The number of repetitions to be applied are obtained from the matrix row-wise. n: number of repetions. times: The number of times to repeat the whole set of rows, after the rows have been replicated consecutively each times. The Matlab implementation of this function accepts n with length > 2. Improve this answer. Some sample data - Aug 29, 2020 · Basically the idea is to set the number of times you want the row to occur (in this case row number 2 - hence row_number() == 2 - will occur twice and all others occur only once but you could potentially construct a more complex feature where each row has a different number of repetitions), and then uncount this variable (called nreps in the code). Dec 10, 2017 · I have a column of length 1536 that contains an hourly 'count' from 1 to 1536. If instead you use rep(1,numTimesToRepeat) %x% mX, you'll get the behavior @user2157086 was seeking: you'll go through all of the rows before repeating. . Matrix with vector x repeated n-times by Oct 17, 2020 · How to replicate a vector to create matrix in R - The matrix can be created by using matrix function in R and if we want to create a matrix by replicating a vector then we just need to focus on the replication. 5 plots are small (X = "s"), and another 5 are large (X = "L"). repeat elements in vector 1 with Example: RStudio Repeat Loop . Mar 19, 2024 · Replicating Rows a Different Number of Times. 6264538 2 2 0. df[!duplicated(df), ] Sep 17, 2008 · Do note that if you want the last few elements of a vector rather than just the last element, there's no need to do anything complex when adapting this solution. It's the number of times you want to repeat a row or column based on the parameter axis. Share Improve this answer Nov 6, 2020 · I want to repeat the rows of a matrix (M) based on the values of a vector (rep_vec). frame. Replicate vector in R. Codingprof. Aug 13, 2013 · I can remove duplicated rows from R data frame by the following code, but how can I find how many times each duplicated rows repeated? I need the result as a vector. Dec 18, 2015 · I am a newbie to R and trying to work through a challenge I have two data tables in R that I want to join together, but also repeat one of the tables (table 2) multiple times. Buy it today! Repeat Rows of Data Frame N Times; Unique Rows of Data Frame Based On Selected Columns; Remove Duplicated Rows from Data Frame; rep Function in R; The R Programming Language . frame(ID=1,Time=1:10,C="A") I want to repeat all rows in the data frame 30 times with a Feb 17, 2018 · If you use a logical vector (TRUE/FALSE) as index (inside []), a TRUE leads to selection of the corresponding element and a FALSE leads to omission. If you have further questions, please let me know in the Jan 1, 2009 · cbind will return a dataframe if one of the arguments is a dataframe. This function is then applied to each row of your initial data. How to repeat values of a vector based on its own value in r. NEW_COLUMN=c(1,2) Original data frame example. A replication factor is declared to define the number of times the data frame rows are to be repeated. frame above, so that each row is repeated the number of times specified in the column 'freq'? In other words, go from this: df var1 var2 freq 1 a d 1 2 b e 2 3 c f 3 To this: Let’s say we want to replicate the first row twice, the second row three times, the third row once, and the fourth row four times: # Vector specifying the number of times to replicate each row replication_times <- c(2, 3, 1, 4) # Replicate rows according to the specified pattern replicated_df <- df[rep(row. I need to duplicate rows for each large plot 20 times, and each small plot 500 times. It is easy to expand the vector on all values using rowwise and unnest together with the condition in if_else. We can use the repmat() function to create a matrix by repeating a single value. Oct 22, 2010 · Repeat rows based on vector. If the logical index vector (c(TRUE, FALSE, TRUE, TRUE)) is shorter than the indexed vector (rep(3:50, each = 2) in your case), the index vector is recyled. E. df<-data. Resp Status Threshold 1 16 3 0 134 4 1 3. Jun 22, 2021 · The rep function allows us to repeat R vectors by specifying how many times we want to repeat the whole vector, or how many times we want to repeat each element of the vector. x: vector or matrix. The loop executes a maximum of n times, where n is the number of columns of valArray , given by numel( valArray (1,:)) . Feb 13, 2019 · I am trying to repeat rows in R multiple times (how often is determined by a column). 5952808 8 4 1. r — Vector of repetition factors for each dimension (as a row vector) integer values Vector of repetition factors for each dimension, specified as a row vector of integer values. Mar 24, 2018 · looking at sweep's code, it boils down to creating a matrix repeating a as rows before multiplying both objects, the return call can be summarized as b*aperm(array(a,rev(dim(b)))) which is faster because we skip the overheads, it can be itself optimized into b*t(a)[rep_len(1,nrow(b)),] to gain about 30% speed compared to original sweep r — Vector of repetition factors for each dimension (as a row vector) integer values Vector of repetition factors for each dimension, specified as a row vector of integer values. Further arguments passed to or from other methods. For Repeat Vectors and Matrices Description. 5. vector sees it is a vector of mode "list" and does nothing. Repeat the character strings in a character vector a given number of times (i. Method 2: Replicate Each Row a Different Number of Times. The following code shows how to use a repeat-loop to add values to a vector until a specific number is reached: Perhaps not that elegant, but. The columns in the matrix correspond to each element in the vector. Feb 18, 2018 · If I have a matrix in R that looks like the below: 1,3 7,1 8,2 How would I write code that creates a matrix like this: 1,3 1,3 1,3 7,1 8,2 8,2 Where it repeats the row based on the right . This is what as. names(df2)), "col2"] <- V # row. 1836433 3 2 0. Method 1 : Using replicate() method. The number of repetitions for each element. Use repeat loop to print first ten Even Numbers in Reverse order. repeats: int or array of ints. frame has other columns (there, I said it!), but the do block will allow you to generate a derived data. ]", row. I'm having a dataset (df) that in a bit simplified looks like this . Ignored if NA or invalid. empty(shape=[0, n]). each: The number of times to replicate consecutively each row in the data. Repeat rows based on vector. I am trying to take an existing vector and repeat each element of it six times. 114. repeats is broadcasted to fit the shape of the given axis. names(df2)), ] <- 0 df2[grep("[. table Jan 14, 2020 · # get vector of table names names(my. Example 2: Add Values to Vector Until Specific Number is Reached. frame by row value? I though that something like this could work: It should be noted that a data frame is already a vector and hence as. If you know the mode of the whole row, or can convert to the same type, you can use the mode's conversion function (for example, as. If any value in r is 0 or negative, the result is an empty array. Doing the double-transpose trick subverts this. 5952808 10 4 1. vec_unrep() compresses a vector with repeated values. Summary: In this R tutorial you have learned how to replicate a character string several Oct 16, 2021 · I would like to repeat rows contain specific values in R with df as below. g. Here is another example of Repeat in RStudio. Add date to first element of vector to get new date and then add the next element to generate new date and so on. Sorry if this is just explaining what you know, but I don't know another way of doing it, except explicitly expanding v into a matrix of the same size. The following R programming code explains how to repeat a vector in the rows of a matrix multiple times. org Repeat Rows of Data Frame N Times in R (2 Examples) This tutorial illustrates how to create (multiple) duplicates of each row of a data frame in the R programming language. e. col<-function(x,n){ matrix(rep(x,each=n), ncol=n, byrow=TRUE) } x is the vector to be repeated and n is the number of replication. Assuming your data called df and your vector called V, could try. And I want to duplicate each row by as many times as indicated in x, as so: x y 1 1 -0. 1836433 4 3 -0. Using the code mentioned below, I calculated the times for constructing the same tiled vector from a base vector A=[1:N]. vector(my. Repeat vector over itself. Matrices. Off the top of my head, I think the only fix would be to set the row names (again using rep ) after the fact. 3295078 15 5 0. For example: m = matrix Mar 14, 2016 · Here's a possible (vectorized) solution using row indexing. Repeat rows Nov 9, 2017 · I need to repeat a block of rows a number of times (different number for different blocks). table with specified rows of a single column from an old data. frame(name1 = c("x","y","z"), name2 = c(0,1,2)) df name1 name2 1 x 0 2 y 1 3 z 2 r — Vector of repetition factors for each dimension (as a row vector) integer values Vector of repetition factors for each dimension, specified as a row vector of integer values. repeat Data N times in R. I have a data frame: data<-data. – Mar 22, 2022 · Repeat elements of vector in R. out. Repeat vector in a dataframe column but start at a given row. Wondering how to duplicate a vector into a matrix in R. Mar 17, 2022 · How to repeat a vector of strings N times in a dataframe using dplyr. Example: Repeating rows n times Jan 4, 2012 · Repeat each row of data. Jun 20, 2012 · There is a lovely vectorized solution that repeats only certain rows n-times each, possible for example by adding an ntimes column to your data frame:. I have: DIAMOND_ID <- c(1,2,3,4,5) MY_MONTHS <- c(201501,201502,201503,201504,201505,201506) So then for each Diamond ID, the months vector would repeat, i. In the other answers and comments where the users said that cbind did work and it created a matrix, they left out that the matrix was a character matrix and the numbers were coalesced to character strings. Sep 2, 2011 · Next time, i don’t have to worry about how to use the matrix and rep command to repeat an vector to form a matrix! Code. 1. I JUST want to create a second column for 'day' that contains 1:7, each repeated 24 times, for the entire vector lengt Helper function to repeat a matrix by row Usage rep_row(x, n) Arguments. Basically I would like to take this vector: 1027 1028 1030 1032 1037 And turn it into this: 1027 1027 1027 1027 1027 1027 1028 1028 1028 1028 1028 1028 Sep 2, 2011 · 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). names(df), times = replication_times), ] rep(x, N) returns a vector repeating x N times. Startup: Initialization at Start of an R Session stop: Stop Function Execution stopifnot: Ensure the Truth of R Expressions strptime: Date-time Conversion Functions to and from Character strrep: Repeat the Elements of a Character Vector strsplit: Split the Elements of a Character Vector strtoi: Convert Strings to Integers strtrim: Trim Dec 24, 2017 · It's the repeats parameter . Repeat each row of data. I would like to add a column with a repeating sequence of 1:5 to use with cut() to do cross validation. 7. Usage What is the simplest way to expand each row the first two columns of the data. 3295078 13 5 0. for example if I have a matrix (I use matrix for example) matrix(c(1,2,3,2,1,3),2) [,1 As GSee notes below, one difference here is that rbind will replicate the row names exactly, while using indexing will force unique row names by appending digits. 5952808 11 5 0. Sep 14, 2021 · The first argument is the vector generated by seq_len() method and n is the replication factor. Aug 22, 2013 · is because R operates down the columns first. Let’s say we want to replicate the first row twice, the second row three times, the third row once, and the fourth row four times: Oct 25, 2013 · This is a clever solution and will repeat the rows, but in an interdigitated way (i. See full list on statology. For example. 8356286 6 3 -0. sapply applies the given function to each element of the vector 1:4 separately, repeating each element 3 times consecutively. A vectorized alternative to rep(`each=`) in R. My matrix should look like this: Dec 31, 2019 · Variable A refers to individuals (user-id). I need to repeat a same value of variable C for each individual. Replicate Matrix in R. Unused at present. unique(df) or . The A double vector is accepted, other inputs being coerced to an integer or double vector. How to replicate a vector in R. Usage strrep(x, times) Arguments r — Vector of repetition factors for each dimension (as a row vector) integer values Vector of repetition factors for each dimension, specified as a row vector of integer values. test[ave(test, test, FUN = length) == 1] #[1] 2 3 5 7 8 Dec 1, 2012 · I am very very new to programming and R. Additional Resources. b <- matrix(rep(1:20), nrow=4, ncol=5) x <- c(5,6,7) b[,3:5] <- t(t(b[,3:5])-x) should do the trick. Oct 2, 2011 · You can't necessarily get it as a vector because each column might have a different mode. names(df2) <- seq_len(nrow(df2)) # Optional, if you don't like your row names df2 # col1 col2 col3 col4 col5 # 1 1 A 12 In R, underneath the "matrix persona" of a matrix is really just a plain old atomic vector, and the "vector persona" of the matrix can be leveraged for vectorized operations. This is how we can pass the val and fill data to rep() and have those elements repeated appropriately. table 0 R Creating new data. A B C A B C NEW_COLUMN X X X X X X 1 X X X X X X 1 X X X X X X 2 X X X X X X 2 Jan 26, 2022 · Imagine I have a vector (the contents of which are not relevant for this example) aux<-c(1:5) I need to create a data frame that has the same vector repeating itself n times (n can vary, sometimes it is 8 times, sometimes it is 7) I did it like this for repeating itself 8 times: aux. Output: [1] 1 [1] 2 [1] 3 [1] 4 [1] 5 Exercise Questions: 1. 8. Repeat a vector by row Usage repRow(x, n) Arguments. row<-function(x,n){ matrix(rep(x,each=n),nrow=n) } rep. 5 3 I would like to perform this ifelse-test on each of the rows Jan 5, 2019 · I am trying to fill a data frame column with a vector, need to repeat the vector values before passing to the next vector value like this. I conducted a small Matlab test to check the speed differential between repmat and tony's trick. x: A vector or matrix. Oct 23, 2012 · Efficiently replicate matrix rows by group in R. numeric()) to convert to a vector. Calculate factorial of a number using repeat. start <- c(1901, 1902, 1950, 1980, 1980) end <- c Jul 21, 2016 · The basic idea is to define a function that will take a single row from your initial data. com is for sale. vector(df[1,], mode="numeric") which is more illustrative. Other inputs will be coerced to a double vector and the first element taken. frame and duplicate rows based on the value in the samples column (as well as creating the distinct character strings you're after). In this case, the first row will be repeated once, the second twice, and the third three times. Each element of x is repeated each times. Each individual has three rows. Aug 12, 2017 · I want to repeat a row vector to create a matrix, in which every row is a slightly modified version of the original vector. I want the datatable to be repeated 7 times such that each 20 rows has one value from the vector. Apr 21, 2022 · We told R to increment x by 1, then print x. column value? Keep in mind I have a matrix that actually has a lot more rows than 2 Dec 18, 2018 · I have a data frame and would like to repeat each row by each element in a pre defined vector. times: Nov 18, 2024 · 3. Jul 7, 2016 · This is rife with peril if the data. – Sep 14, 2023 · How to create a vector with repeated values in R - There are two methods to create a vector with repeated values in R but both of them have different approaches, first one is by repeating each element of the vector and the second repeats the elements by a specified number of times. I work in R. Or write a nice function that wraps the not very R-style code into something that is R-stylish. valArray — Create a column vector, index, from subsequent columns of array valArray on each iteration. , you'll get row 1 repeated numTimesToRepeat, and after that row 2 repeated numTimesToRepeat). Sep 2, 2019 · How do I repeat vector elements by times in another vector elements in R? 0. I feel like this should be easy using rep() but I keep hitting the wall. This might be simple but I am not able to get how to do this. numeric does. vec_rep() repeats an entire vector a set number of times. How to iterate over a variable in rep() 0. May 16, 2021 · You can use uncount to repeat each row 12 times and create month column using row_number()- Repeat rows based on vector. I have a data frame with 1666 rows. – Jun 7, 2022 · For example, we can define the number of times the given array or matrix will repeat itself in the row and column dimension using the vector r, which will contain the number of times the input array or matrix will be repeated to create the output matrix. The following tutorials explain how to perform other common tasks in R: How to Create a Frequency Table by Group in R How to Create a Frequency Polygon in R How to Create Relative Frequency Tables in R The part where you only want to keep specfic values and others not, makes this tricky. non-negative integer. 39. Jul 22, 2020 · I want to repeat each element in a vector 'A', the number of times specified in a matrix 'a'. Each individual has different values for variable B whereas they need to have a same value of variable C. Example: I want to repeat a vector N times but element-wise, not the whole vector. The repeated values are returned as a key alongside the number of times each key is repeated. It uses the trick of indexing a list like a vector, with single-bracket [ ] notation (and repeated indices). 3295078 May 2, 2015 · Repeating sets of rows according to the number of rows by column in R with data. It would look like this: Y x1 x2 Id Jul 12, 2016 · I want to be able to repeat the following vector down the dataframe, for each Diamond_ID. 3. x: matrix. For this task, we can apply the t() and replicate() functions as shown below: mat1 <- t ( replicate ( 3 , vec ) ) # Duplicate vector in matrix rows mat1 # Print matrix Sep 14, 2021 · In this article, we will discuss how to repeat rows of Dataframe for a given number of times using R programming language. repeating row of a column in a Repeat rows based on vector. 9. Repeat a Vector n times Assume that our vector is the x<-c(1,2,3,4,5) and we want to repeat it 3 times : Aug 22, 2013 · is because R operates down the columns first. Other Convert Character String to Date Object in R; Find Position of Character in String; Extract Numbers from Character String Vector in R; Capitalize First Letter of Each Word in Character String; Repeat Rows of Data Frame N Times; All R Programming Tutorials . A matrix is a two-dimensional data structure where all elements must have the same data type. In that case, it simply acts as a wrapper for data. frame whose rows are to be repeated. the ideal solution would be a dataframe such as: I imagine this is a loop function? vec_rep() repeats an entire vector a set number of times. I am trying to repeat a calculation (statistical distance) for each row of a matrix. 3295078 14 5 0. n: number of replication. So I have a stand (STAND) and 5*2 plots in each stand. A second way to call the REPEAT function is to provide an argument, freq that has the same number of elements as x. where dup looks like rbind(1:10,1:10). df2 <- df[rep(seq_len(nrow(df)), each = length(V) + 1), ] df2[grep("[. I have tried to find an answer to my question, but part of the problem is I don't know exactly what to search. It should also be noted that a concatenated vector in R, e. Here is what I have so far: Jan 10, 2017 · Can someone please help me with an easy solution for this problem. We subset the matrix to change only the part we need, and we use t() (transpose) to flip the matrix so simple vector recycling will take care of subtracting from the correct row. In summary: On this page you learned how to repeat a sequence multiple times in the R programming language. 8356286 7 4 1. 6. May 19, 2017 · I want to create multidimensional arrays that repeat a vector along along the other dimensions. To facilitate understanding of the underlying mechanisms try as. Just a heads up: duplicated is a function which finds duplicates within a vector. Repeat a vector 3, 2, 1 time. , concatenate the respective numbers of copies of the strings). Author(s) TszKin Julian Chan Sep 18, 2019 · I want to add a column to my datatable based on a vector. It is essentially a collection of vectors arranged in rows and columns. rep. Repeat the Elements of a Character Vector Description. 8356286 5 3 -0. The return value is a row vector in which x[1] is repeated freq[1] times, x[2] is repeated freq[2] times, and so forth, where the elements of x are enumerated in row-major order. Value. m: Mar 10, 2017 · You can use ave to count the length of sub-groups divided by unique values in test and retain only the ones whose length is 1 (the ones that have no duplicates). Both of these methods use rep function to create the vectors Nov 21, 2013 · Suppose I have a matrix m and a positive integer vector v, what I want to do is get a new matrix m_new and each row of m (say m[i, ]) are replicated by v[i] times in m_new. frame(aux,aux,aux,aux,aux,aux,aux,aux) r — Vector of repetition factors for each dimension (as a row vector) integer values Vector of repetition factors for each dimension, specified as a row vector of integer values. My initial code works only sometimes for some reason. frame [see ?cbind]. 0. Repeat columns or rows Description. However my datatable is having 20 rows and my vector is having 7 values. tab) [1] "a1" "a5" # get number of repetition as. c(5, 2), becomes a column vector when coerced to matrix, even though it may look like a row vector at first glance. The desired length of the output vector. Repeat a vector or matrix a specific number of times.
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