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
7
votes
1 answer
Split list every n elements and cbind, then rbind slices
I would like to slice every n elements of list, cbind the slice, and then rbind the slices.
I can do this with the code below (n = 10 elements, list is 30 elements long). I 'manually' select every 10 elements of the list and then cbind these 10…
nofunsally
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6
votes
2 answers
Combining cbind and paste in linear model
I would like to know how can I come up with a lm formula syntax that would enable me to use paste together with cbind for multiple multivariate regression.
Example
In my model I have a set of variables, which corresponds to the primitive example…
Konrad
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6
votes
1 answer
cbind with data table and data frame
I have a question regarding the characteristics of cbind in a data table and a data frame.
If I am binding a data frame(df) and a data table(dt), then the class of the resultant object depends on the first parameter.
example:
>…
Anuj
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6
votes
1 answer
cbind converting factor to numeric
Not sure why this is happening. I have a dataframe df2 with the variables below:
EVTYPE TOTAL_FATALITIES TOTAL_INJURIES
(fctr) (dbl) (dbl)
1 TORNADO 5633 91346
2 EXCESSIVE HEAT …
Glitch
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5
votes
4 answers
Binding dataframes of different length (no cbind, no merge)
I am trying to display multiple dataframes next to each other to compare certain entries. However, they have a different number of rows and I want each data frame to be in the exact same order.
I tried to use cbind which did not work because of the…
Linda Espey
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5
votes
3 answers
Replacement of plyr::cbind.fill in dplyr?
I apologize if this question is elementary, but I've been scouring the internet and I can't seem to find a simple solution.
I currently have a list of R objects (named vectors or dataframes of 1 variable, I can work with either), and I want to join…
Tom
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5
votes
1 answer
Read and cbind second column of multiple files in directory
I have 94 tab delimited files, no header, in a single directory '/path/' with gene names in the first column and counts in the second column. There are 23000 rows.
I would like to read all 94 files found in /path/ in to R and merge all of the 94…
rvann
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5
votes
3 answers
cbind specific columns from multiple data.tables efficiently
I have a list of data.tables that I need to cbind, however, I only need the last X columns.
My data is structured as follows:
DT.1 <- data.table(x=c(1,1), y = c("a","a"), v1 = c(1,2), v2 = c(3,4))
DT.2 <- data.table(x=c(1,1), y = c("a","a"), v3 =…
greyBag
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5
votes
2 answers
how to cbind the column generated in a loop in R
I have a for loop that gives me a column of data per run. I run the for loop in the range 0:4, so it gives me 5 columns. If I print it out, it is like column1, column2, ... I want to save all of the 5 columns together as a csv file. In this one…
cppython
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5
votes
2 answers
How to create a data frame with numeric and character columns?
I'm trying to build a data frame consisting of three character variables and one numeric variable. When I run the following code, I get a four-column matrix, but the score variable is no longer numeric, and the scores are treated as…
user3614783
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5
votes
1 answer
In R, when using named rows, can a sparse matrix column be added (concatenated) to another sparse matrix?
I have two sparse matrices, m1 and m2:
> m1 <- Matrix(data=0,nrow=2, ncol=1, sparse=TRUE, dimnames=list(c("b","d"),NULL))
> m2 <- Matrix(data=0,nrow=2, ncol=1, sparse=TRUE, dimnames=list(c("a","b"),NULL))
> m1["b",1]<- 4
> m2["a",1]<- 5
> m1
2 x 1…
ayman
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5
votes
2 answers
cbind replaces String with number?
x = iris$Sepal.Width;
y = iris$Species;
m = cbind(x,y);
the output of m is:
x y
[1,] 3.5 1
[2,] 3.0 1
[3,] 3.2 1
[4,] 3.1 1
[5,] 3.6 1
[6,] 3.9 1
but I want 'setosa', etc in column y instead of a number
how can I do that?
I…
user2071938
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5
votes
3 answers
cbind items from multiple lists recursively
Given three (or n lists):
one <- list(a=1:2,b="one")
two <- list(a=2:3,b="two")
three <- list(a=3:4,b="three")
What would be a more efficient way of cbindind each list item across the n lists, to get this…
thelatemail
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4
votes
3 answers
Why can't I add numbers in a dataframe created with cbind?
I’m looking for advice on how to subtract values from each other listed in two data frames. In the example below with the two data frames A and B, I would like to subtract the values of the 2nd columns from each other on the condition that the first…
Thomas Larsen
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4
votes
2 answers
Inserting NAs columns in specific positions of a data frame in R
I'm struggling to try to insert NAs columns in specific positions of a data frame.
For instance, I have the dataset:
dataset <- data.frame(c1 = 1:5,
c2 = 2:6,
c3 = 3:7,
c4 = 4:8,…
Helio Camargo
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