The functions cbind and rbind are S3 generic, with methods for data frames. The data frame method will be used if at least one argument is a data frame and the rest are vectors or matrices. There can be other methods; in particular, there is one for time series objects. See the section on ‘Dispatch’ for how the method to be used is selected.
Questions tagged [cbind]
450 questions
-1
votes
1 answer
Is there a trick to looping with cbind?
I have 87 vectors of length 4096. For example,
> head(d[[1]]$x)
[1] 1.676094 1.676323 1.676551 1.676780 1.677008 1.677237
I would like to concatenate these vectors into a matrix with each vector occupying a column. Because cbinding them…
user1038055
- 79
- 9
-1
votes
1 answer
concatenate a specific cell from a number of files into one single row in R
I have a folder with several files. From each file I would like to select a cell (third row, 5th column) and bind them into one single column. Here's what I've got so far:
fnames1 <- scan(file.choose(), what = "character", quiet = TRUE)
…
user3713629
- 13
- 6
-1
votes
1 answer
cbind multiple files having same number of columns still error "arguments imply differing number of rows"
I have a folder with 40 files (although I want to write the code so that it works with any number of files as this will come up all the time for me). All I want to do is obtain a new file that compiles all those files together as columns. Each…
user3713629
- 13
- 6
-1
votes
1 answer
Using cbind to create a columnar .csv file but 'X' always appears in row one
I have a script that is working perfectly except that in my R cbind operation, adjacent to the numerical value that I require in the first row, is an 'X'.
Here is my…
cohara
- 111
- 3
- 19
-2
votes
1 answer
subtraction and division of row values in a data frame column
The details of the dataframe are
ID Price Result
1 20 -0.1
2 18 0.1667
3 21 -0.2381
4 16 0.1875
5 19 -1
so i have to subtract the second row from first row then divide by the first row.…
Prad
- 339
- 1
- 10
-2
votes
3 answers
Merging two data frames with different numbers of observations and matching them
The data frame below presents two data frames that I merged through cbindX(Period1, Period2). Both have the same columns but represent two time periods and have different observations for AEZ.
Example for Abyei and Angola
> dput(new_data2[1:6,…
Myr TH
- 175
- 1
- 9
-2
votes
1 answer
Is there an R function that splits the columns of a data.frame and cbind them together?
I have a data frame and a column with over 1.000.0000 values. I know that I need to take values from 1:30.000 then, 30.000:60.000 and so on, and cbind this parts, to get multiple columns out of the original one. How do I do that?
user11465312
- 11
- 6
-2
votes
3 answers
Combine matrices row by row
I have two matrices of arbitrary sizes, e.g. matrix 1 (n * m) and matrix 2 (k * l). Is there a (convenient) way in R to cbind them row-by-row, to form a (n * k) * (m + l) matrix where each row of matrix 1 has a chance to be cbinded to each row of…
Ken Chen
- 7
- 3
-2
votes
1 answer
R: cbind dataframes with common column names
Cbinding two dataframes (equal number of rows) with a few columns having common names normally results in a data.frame with the common names altered (e.g. NameA.1, NameB.1, etc) to avoid any issues.
I noticed that even though the names have changed,…
IVy
- 119
- 3
- 7
-2
votes
1 answer
cbind recycled rows to add to last row in R
I have a question about cbinding recycled items. I simplified my problem into the following code.
I have two objects "a" and "b". "a" has 5 rows and "b" has 10 rows.
When I cbind them, I get a data.frame with 10 rows, and my column "a" recycles…
NoVice
- 43
- 5
-3
votes
1 answer
Binding together the tables created in a loop
I managed to create a loop that opens the csv files that I have in a folder and adds the file name in the first column. However, I don’t know how to put together all the tables created so that the final output after the loop is one data.frame with…
Carlos
- 47
- 6
-3
votes
1 answer
combining variable columns with same values within the same dataset into a new variable
dataset being used is in this google sheets link
https://docs.google.com/spreadsheets/d/1eV33Sgx_UVtk2vDtNBc4Yqs_kQoeffY0oj5gSCq9rCs/edit#gid=1959019385&vpid=A1
AMC.dataset$ExamMC.A<-surveySP15$Exams_A
AMC.dataset$ExamMC.A<-factor(NA,…
chris Hahn
- 1
- 3
-5
votes
3 answers
Combing two dataframes based on matching strings in multiple columns
Say I have two dataframes, df1 and df2, that look like this:
student x y teacher value
s.name1 4 5 t.name1 1
s.name2 3 3 t.name1 2
s.name2 2 1 t.name2 3
s.name3 5 5 t.name3 1
and that I…
soosus
- 1,211
- 4
- 18
- 27
-5
votes
2 answers
Could you please help me to understand an R code?
I'm completely new to R. Would you please explain me the following code? Thank you a lot in advance.
patterns <- matrix(c(0,0,0,1,0,1,0,1,1,1,1,0),4,3, byrow = T)
input <- unlist(lapply(1:100, function(i) {
ps <-…
David
- 3
- 6