cbind {base} | R Documentation |
Take a sequence of vector and/or matrix arguments and combine them as the columns or rows, respectively, of a matrix.
cbind(...) rbind(...)
The functions cbind
and rbind
are generic, with methods
for data frames.
If there are several matrix arguments, they must all have the same
number of columns (or rows) and this will be the number of columns (or
rows) of the result. If all the arguments are vectors, the number of
columns (rows) in the result is equal to the length of the longest
vector. Values in shorter arguments are recycled to achieve this
length (with a warning
when they are recycled only
fractionally).
When the arguments consist of a mix of matrices and vectors the number of columns (rosw) of the result is determined by the number of columns (rows) of the matrix arguments. Any vectors have their values recycled or subsetted to achieve this length.
The method dispatching is not done via
UseMethod(..)
, but by C-internal dispatching.
Therefore, there's no need for, e.g., rbind.default
.
c
to combine vectors (and lists).
cbind(1,1:7) # the '1' (= shorter vector) is recycled cbind(1:7, diag(3))# vector is subset -> warning cbind(0,rbind(1,1:3)) cbind(0, matrix(1, nrow=0, ncol=4))#> Warning (making sense) dim(cbind(0, matrix(1, nrow=2, ncol=0)))#-> 2 x 1