a character string or a character vector of length two giving the name(s)
of the boundary rule. All the boundary rules listed for
convdown are available
except for
"infinite". See
convdown for the definitions of these rules.
fast
logical flag indicating if fast algorithm should be used.
VALUE:
If
nrow(x) is even,
hor.convdown returns an
nrow(x)/2 by
ncol(x) matrix.
If
nrow(x) is odd, see
convdown for details on the number of rows of output.
If
ncol(x) is even,
ver.convdown returns a
nrow(x) by
ncol(x)/2 matrix.
If
ncol(x) is odd, see
convdown for details on the number of columns of output.