Selects (subscript extraction) a column, as a 1-dimensional dataset, from a 1-
or 2-dimensional dataset.
USAGE:
select.col(x, column)
REQUIRED ARGUMENTS:
x
1- or 2-dimensional dataset whose column will be selected. A 1-dimensional
dataset is considered to be a single, unnamed column.
column
logical, integer, or character value specifying the column of
x which is to be
selected.
VALUE:
The subscript extraction of
column of
x, as a 1-dimensional dataset.
SEE ALSO:
,
,
,
,
.
EXAMPLES:
# typical way to allow/verify column selection by name or number
"column.select"<-
function(x, select.spec)
{
select.spec <- index.rowcol(x, select.spec, which="columns")
valid.rowcol(select.spec, 1, count.cols(x), T)
select.col(x, select.spec)
}