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Questions tagged [combn]

121 questions
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Error in combn(unique(x), 2, paste, collapse = " and ") : n < m

I have a 185,686 rows data frame with 11 variables but I'm only interested in two: Order.ID and Product Each line of the original data frame contains an unique combination of ID, product, quantity, adress, etc. From this df I created a new one that…
Eduardo Neiva
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How to iterate column values to find out all possible combinations in R?

Suppose you have a dataframe with ids and elements prescripted to each id. For example: example <- data.frame(id = c(1,1,1,1,1,2,2,2,3,4,4,4,4,4,4,4,5,5,5,5), vals = c("a","b",'c','d','e','a','b','d','c', …
rg4s
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How to see which element (of length x) in a list is contained in which other element (of length x+1) of that list?

Say I have the following list: unlist(mapply(combn, list(1:3), seq_along(1:3), simplify = FALSE), recursive = FALSE) Now, I want to know for each element of length x in the list, in which other elements of length x+1 it is contained. Preferably, it…
Alexander
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Finding the index of the vector for the sum of pairwise in R

When I run this code x <- c(2, 2, 10, 8) combn(x, 2, sum) I get > combn(x, 2, sum) [1] 4 12 10 12 10 18 How do I get the index for x for any of the combn? For this question, the 4 is the sum of 2 + 2 which is x[1] + x[2]. I need the index [1] and…
skadoosh
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Running a combn function on different columns of a dataframe, one row at a time

I have the following data frame : # A tibble: 3 x 4 index number_1 number_2 number_3 1 1 32 16 29 2 2 13 50 47 3 3 37 19 18 I would like to run a…
Frederi ROSE
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How do use combn generally when pairs are not always possible?

I am looking for a generic method to deal with situations in which combinations are required, but when data does not always meet the assumptions of the combn function. Specifically, I have a dataframe of members of Congress and their committee…
Ben
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Get all combinations for a dynamic length of elements to select

I have a data frame: dat <- data.frame(toys = c("bear", "car", "plane", "truck", "doll"), price = c(1.23, 2.34, 3.45, 4.56, 5.67)) I now want to get all combinations of toys where I would select 2, 3 and 4 toys at a time. I could…
deschen
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R - maximum value of variables when compared between levels of variable1 grouped by variable2

Consider the following data set.seed(123) example.df <- data.frame( gene = sample(c("A", "B", "C", "D"), 100, replace = TRUE), treated = sample(c("Yes", "No"), 100, replace = TRUE), resp=rnorm(100, 10,5), effect = rnorm (100, 25, 5)) I am trying…
jaydoc
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Is there a more memory-efficient way to use combn to subtract every column from every other column in R?

I am trying to subtract each column from each other column in a large R data.table, that has 13125 columns and 90 rows. I am following up on a previous question which addresses this for data.tables of smaller dimensions (Subtract every column from…
fields
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How do I use combn for multiple regression (or an alternative)?

I want to get regression coefficients and fit statistics from one dependent regressed on all combinations of two other independent factors. What I have is data like this (Note the NA): H<-data.frame(replicate(10,sample(0:20,10,rep=TRUE)))…
CrunchyTopping
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Applying combine function over dataframe and saving as a single list/dataframe

I am trying to create a network. I have a dataframe: . . v1 .v2 .v3 1/ .1 ... 2.... 3 2/ .3 ... 4 .. 7 3/. 6 ...11 . 9 I wish to find all possible combinations within each row. For example, the 1st row has the values 1, 2, 3 so the result…
Ethan Hunt
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Differences between all possible pairs of rows for all columns within each level of factor

I want to build all possible pairs of rows in a dataframe within each level of a categorical variable name and then make the differences of these rows within each level of name for all non-factor variables: row 1 - row 2, row 1 - row 3,…
Julien
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How would I find all combinations/permutations with order mattering in R?

Hello and thanks for looking. I'm not exactly sure how to ask this question - let me show you an example and what I'm hoping to return. example <- c(1, 2, 3, 4, 5, 6) example_combos <- combn(example, 4) 1) How would I adapt combn() to just give me…
min7b5_b9_b11_b13
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Looping in Dplyr

My question refers to looping in Dplyr. I'm trying to determine the mean, count number and variance for DV1 for each unique combination of independent variables (IV1:IV5). My data looks like this: DV1 IV1 IV2 IV3 IV4 IV5 506.2 …
user1681537
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Efficiently calculate a consensus set of members in R

I have a very large (millions of points) connected graph and many potential segmentation algorithms to determine group membership. Is there an existing implementation in sets or a similar R package for calculating a consensus set among possible…
bw4sz
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