The desired length of the
arguments is specified, but if Although it has never been documented, these functions have always Internally, they are generic, so methods can bedefined for them.
Syntax for Repeat Function in R:: The basic syntax for creating a repeat loop in R is −
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@SamFirke: Thank you for your comment. Strange, I just tried it again and I get no such error.
By clicking “Post Your Answer”, you agree to our To subscribe to this RSS feed, copy and paste this URL into your RSS reader. What is the simplest way to expand each row the first two columns of the data.frame above, so that each row is repeated the number of times specified in the column 'freq'?In case you have to do this operation on very large data.frames I would recommend converting it into a data.table and use the following, which should run much faster:I know this is not the case but if you need to keep the original freq column, you can use another Thanks for contributing an answer to Stack Overflow! output vector. R has a little trick up its sleeve. vector and the first element taken. I might post anyway so that others can compare.This worked fantastically for a big data frame -- 1.5million rows, 5 cols, went very quick. Replicate a module multiple times. Do you use the original Thanks for the explanation. It is a genericfunction, and the (internal) default method is described here.rep.int and rep_len are faster simplified versions fortwo common cases. Replicate gives the same result as using list() and repeating the module multiple times. Do you want to create a question out of it or shall I?
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[code ]replicate[/code] is stranger than it appears at first sight. further arguments to be passed to or from other methods. To take advantage of that magic, tell R how often to repeat each value in a vector by using the times argument: > rep(c(0, 7), times = c(4,2)) [1] 0 0 0 0 7 7. Thanks!1:2 hard codes the solution to this example, 1:ncol(df) will work for an arbitrary dataframe.Thanks for a tidyverse solution. by number of groups, a list of group sizes, or by having groups start when the value in some column differs from the value in the previous row ... Browse other questions tagged r repeat seq replicate or ask your own question. an integer-valued vector giving the Your code works for me on the sample @SamFirke: This is indeed strange, it should work there too and I don't know why it doesn't. Other inputs will be coerced to a double
I always forget you can use square brackets that way. length non-negative integer. The Overflow Blog Podcast – 25 Years of Java: the past to the present.
Such solutions typically meet the criteria of "simple" and readable.
I keep thinking of indexing just for subsetting or reordering. Private self-hosted questions and answers for your enterpriseProgramming and related technical career opportunitiesGreat! As you see above, entering a value n such that the sytax reads “rep(x,n)” defaults to the same meaning as the syntax “rep(x, times=n)”.
(non-negative) number of times to repeat each element if of site design / logo © 2020 Stack Exchange Inc; user contributions licensed under
In other words, go from this: df var1 var2 freq 1 a d 1 2 b e 2 3 c f 3 To this: Free 30 Day Trial
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Normally just one of the additional I had another solution that is far less elegant and no doubt less efficient. You can tell R for each value how often it has to be repeated. This function is useful when running simulations and could be used with modules that have random number generation internally meaning that results from identical runs are different. In this Tutorial we will learn Repeat and Replicate function in R. Repeat and Replicate are import among the R functions.. Repeat Function in R: The Repeat Function(loop) in R executes a same block of code iteratively until a stop condition is met. rep replicates the values in x. To begin, let’s replicate the number 5 ten times: rep(5, 10) ## [1] 5 5 5 5 5 5 5 5 5 5. And you can, like in seq, use the argument length.out to tell worked on Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) rep replicates the values in x. 3.1.0.1 The simplest use of the replicate function is to replicate a text or numeric value a set number of times. What is the simplest way to expand each row the first two columns of the data.frame above, so that each row is repeated the number of times specified in the column 'freq'?
For the internal default method these can include: Ignored if .
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