spam (version 1.4-0)

cbind: Combine spam Matrices by Rows or Columns

Description

Take a sequence of vector, matrix or spam object arguments and combine by columns or rows, respectively.

Usage

cbind.spam(…, deparse.level = 0)
rbind.spam(…, deparse.level = 0)

Arguments

...

vectors, matrices or spam objects. See ‘Details’ and ‘Value’

deparse.level

for compatibility reason here. Only 0 is implemented.

Value

a spam object combining the … arguments column-wise or row-wise. (Exception: if there are no inputs or all the inputs are NULL, the value is NULL.)

Details

rbind and cbind are not exactly symmetric in how the objects are processed. The former is essentially an concatenation of the slots due to the sparse storage format. Different types of inputs are handled differently. The latter calls a Fortran routine after the input has been coerced to spam objects.

Only two objects at a time are processed. If more than two are present, a loop concatenates them successively.

A method is defined for a spam object as first argument.

Examples

x <- cbind.spam(1:5,6)

y <- cbind(x, 7)

rbind( x, x)
# for some large matrices   t( cbind( t(x), t(x)))
# might be slightly faster: