Syntax
BD>data : <N
BD>data : <N
BD>data : <N
BD>data : <N
If the first form of the command is issued, with no channel number being
specified, the channel number is deduced - [B/D] does not allow
duplicate labels. In the third form of the syntax, the beginning of the
file associated with the input channel is indicated. In common with
other macro facilities, the channel number can be zero (meaning the
keyboard): a label should not be supplied in this case. The address
implied by the channel and label supplied must exist at the time the
command is issued. If the fourth form of the syntax is used, the data
should appear on the lines following the command. If interactive data
input is required, you may use either the third form of the syntax
(interactively, or from a subroutine on an external file, using channel
number 0), or by using the fourth form of the syntax.
where L is the name of a label and 
[,E ] [,N 
] [,E ] ... > I @L(C) 
[,E ] [,N ] [,E ] ... > I @L [,E ] [,N ] [,E ] ... > I (C) [,E ] [,N ] [,E ] ... > I 
is a valid
input channel number. I is a positive integer representing the
number of observations to be read in to [B/D]. 
are valid equations which when rounded amount to a positive
integer. 
are the names of bases,
data-elements, or elements.
