| cBind {Matrix} | R Documentation |
The base functions cbind and rbind are
defined for an arbitrary number of arguments and hence have the first
formal argument .... For that reason, in the past S4 methods
could easily be defined for binding together matrices inheriting from
Matrix.
For that reason, cbind2 and rbind2 have
been provided for binding together two matrices, and we have
defined methods for these and the 'Matrix'-matrices.
Before R version 3.2.0 (April 2015), we have needed a substitute for
S4-enabled versions of cbind and rbind, and
provided cBind and rBind with identical syntax and
semantic in order to bind together multiple matrices ("matrix"
or "Matrix" and vectors.
With R version 3.2.0 and newer, cBind and rBind are
deprecated and produce a deprecation warning (via
.Deprecated), and your code should start using
cbind() and rbind() instead.
cBind(..., deparse.level = 1) rBind(..., deparse.level = 1)
... |
matrix-like R objects to be bound together, see
|
deparse.level |
integer determining under which circumstances
column and row names are built from the actual arguments'
‘expression’, see |
The implementation of these is recursive, calling
cbind2 or
rbind2 respectively, where these have methods
defined and so should dispatch appropriately.
typically a ‘matrix-like’ object of a similar
class as the first argument in ....
Note that sometimes by default, the result is a
sparseMatrix if one of the arguments is (even in
the case where this is not efficient). In other cases,
the result is chosen to be sparse when there are more zero entries is
than non-zero ones (as the default sparse in
Matrix()).
Martin Maechler
cbind2, cbind,
Documentation in base R's methods package
.
(a <- matrix(c(2:1,1:2), 2,2))
D <- Diagonal(2)
if(getRversion() < "3.2.0") {
M1 <- cbind(0, rBind(a, 7))
print(M1) # remains traditional matrix
M2 <- cBind(4, a, D, -1, D, 0) # a sparse Matrix
print(M2)
} else { ## newer versions of R do not need cBind / rBind:
M1 <- cbind(0, suppressWarnings(rBind(a, 7)))
print(M1) # remains traditional matrix
M2 <- suppressWarnings(cBind(4, a, D, -1, D, 0)) # a sparse Matrix
print(M2)
stopifnot(identical(M1, cbind(0, rbind(a, 7))),
identical(M2, cbind(4, a, D, -1, D, 0)))
}# R >= 3.2.0