Questions tagged [combn]
121 questions
0
votes
1 answer
combn dataframe R for 1 variable only
I have a data.frame with the following structure:
x1 x2 x3 x4 x5 x6
y n y n n y
n n y n n y
y y y y y n
I want to make combinations combn() but using only for only 1 of the variable, I mean, gettingthis result:
x1 x2
x1 x3
x1…
Ochetski
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0
votes
3 answers
Selecting combination with a fixed column in R
I have a data frame which looks like this
aa bb
--------
a 1
a 2
a 3
b 4
b 5
b 1
I want above data frame to have a pair of elements picked from 'bb' and look like the below frame
aa bb …
user2575429
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0
votes
1 answer
pairwise subtraction in a dataf rame with groups in different lengths
I have a data frame in 18528 rows and 3 columns like below:
Sample Target Value
100 A 21.5
100 A 20.5
100 B 19.5
100 B 19.75
100 B 18.15
100 B 21.95
200 A 21.1
200 A…
Lili
- 75
- 7
0
votes
2 answers
How to convert a 'by' [list] output into a dataframe
data= data.frame(col1=c('m1','m1','m1','m2','m2', 'm2','m3', 'm3'), class=c('a','b','c','a','b','c', 'a', 'b'))I have a data.frame with 2 columns, the 1st column is a list of models, the 2nd column a list of model attributes. I need to show…
LuluPor
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- 11
0
votes
1 answer
Generate binary matrix of all nCm up to certain m with ncol=n
Wondering if there's a faster way to achieve the following:
I have a vector of max. length long1 which is all zeros.
How do I generate a matrix of all possible combinations of ones in certain positions up to and including the maximum max1s.
The…
dardisco
- 5,086
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0
votes
2 answers
generating a matrix with all possibilities in matlab
is there a simple command to do this:
M = 0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
i found this http://www.mathworks.co.kr/matlabcentral/fileexchange/7147-combn--4-3- but this isn't yet a thing in matlab
tried M =…
jabk
- 1,388
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- 43
-1
votes
1 answer
Combination with conditions in R
how to make a combination of letters
label=c("A","B","C","D","E")
into a dataframe with 4 group (G1, G2, G3, G4) as follows
k2=data.frame(G1=c("AB","AC","AD","AE","BC","BD","BE","CD","CE","DE"),
G2=c("C","B","B","B","A","A","A","A","A","A"),
…
Michele
- 29
- 1
-1
votes
2 answers
All combinations of summing a vector of numbers together
Given I have the vector and a target number
target.mountain <- 10
Roll_dice <- sample(1:6, 4, replace=TRUE)
With Roll_dice producing
[1] 6, 5, 3, 2 as an example
How can I produce a list of all numbers in Roll_dice with all the ways of adding them…
-1
votes
2 answers
Creating a Basic R Dice Rolling Function to Sum Dice Values
I'm trying to write a function that combines up to 4 (fair 6 sided) dice rolls to create a specific value (named 'target.mountain') as many times as possible given the numbers shown on the dice.
Then return these values along with any that aren't…
-1
votes
3 answers
Number of combs returned by combn reduced by some combs in R
I am trying to figure out how to reckon the number of combinations returned by combn function after exclusion of some selected combinations. Let's say, we have a vector c("var1","var2","var3","var4","var5") and I want to get all combinations of the…
New2coding
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- 23
-1
votes
1 answer
Create all vector combinations summing up to a specific number in R
I am trying to create a matrix with two combinations of the same vector that sum up to 2300. I am using thecombnfunction in R, see the code below:
vector <- 400:1900
combinations <- combn(vector, 2, function(x) subset(x,…
Gion Mors
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- 20
-1
votes
1 answer
R: How to apply median to combn output?
I have a dataframe:
df1
vec1 vec2 vec3 vec4 vec5
0 10 5 12 5
10 20 13 1 7
20 30 28 13 16
And I perform combn() on it:
x = combn( df1[,1:4] , 3 )
Which returns a matrix like this:
x
V1 …
James H
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-2
votes
1 answer
is there a R code for group_by and combinations
Am kindly looking for R code that can calculate the combinations with 2, of the total in each group.
library(dplyr)
id<-c(1,1,1,1,2,2,2,2,3,3,3,3)
sex<-c(1,1,1,1,1,1,1,1,1,1,1,1)
ds<-data.frame(id,sex)
out1<-ds %>% group_by(id) %>%…
Sam Mwenda
- 150
- 8
-2
votes
1 answer
Why doesn't combn() using paste0 as the FUN give me the expected result (r)
I'm trying to create a list of combinations of strings using combn() with paste0 as the function, but all I get back is the matrix of combinations. What am I doing wrong?
Example:
combn(LETTERS[1:5],3, FUN=paste0)
Gives me:
[,1] [,2] [,3] [,4]…
iod
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-3
votes
1 answer
Finding all unique combinations of 1:n numbers without packages
I need to create a function that provides me with all possible combinations of 1:n numbers. The argument of the function being n. I need to do this without using the combn function or any other pre-installed function within R.
This picture above…
aa710
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