R version 2.14.2 Patched (2012-02-29 r58546)
Copyright (C) 2012 The R Foundation for Statistical Computing
ISBN 3-900051-07-0
Platform: i486-pc-linux-gnu (32-bit)

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> ##
> library("slam")
> x <- matrix(1:12, 4, dimnames = list(NULL, B = 1:3))
> s <- as.simple_sparse_array(x)
> s
A simple sparse array of dimension 4x3.
> 
> extend_simple_sparse_array(s,  0L)
A simple sparse array of dimension 1x4x3.
> extend_simple_sparse_array(s, -1L)  ## the same
A simple sparse array of dimension 1x4x3.
> extend_simple_sparse_array(s,  1L)
A simple sparse array of dimension 4x1x3.
> extend_simple_sparse_array(s,  2L)
A simple sparse array of dimension 4x3x1.
> extend_simple_sparse_array(s, -3L)  ## the same
A simple sparse array of dimension 4x3x1.
> 
> extend_simple_sparse_array(s, c( 0L,  0L))
A simple sparse array of dimension 1x1x4x3.
> extend_simple_sparse_array(s, c(-3L, -3L))
A simple sparse array of dimension 4x3x1x1.
> 
> ## automatic
> z <- abind_simple_sparse_array(s, 1:3)
> z
A simple sparse array of dimension 5x3.
> all.equal(as.array(z), rbind(x, 1:3))
[1] "Attributes: < Component 2: names for target but not for current >"
> z <- abind_simple_sparse_array(1:4, s, MARGIN = 2L)
> z
A simple sparse array of dimension 4x4.
> all.equal(as.array(z), cbind(1:4, x))
[1] "Attributes: < Component 2: names for target but not for current >"
> 
> abind_simple_sparse_array(1:3, array(2:4, c(1,3)), array(3:8, c(1,2,3)))
A simple sparse array of dimension 2x2x3.
> abind_simple_sparse_array(1:3, array(2:4, c(3,1)), array(3:8, c(3,2,1)), MARGIN = 3L) 
A simple sparse array of dimension 3x2x2.
> 
> ## manual
> abind_simple_sparse_array(1:3, 2:4)
A simple sparse array of dimension 6.
> abind_simple_sparse_array(1:3, 2:4, MARGIN = -1L)
A simple sparse array of dimension 2x3.
> abind_simple_sparse_array(1:3, 2:4, MARGIN = -2L)
A simple sparse array of dimension 3x2.
> 
> ###
>