DO DATA Statement
repeats a loop until an end of file occurs
- DO DATA <variable=start
TO stop>;
The inputs to the DO DATA statement are as follows:
- variable
- is the name of a variable indexing the loop.
- start
- is the starting value for the looping variable.
- stop
- is the stopping value for the looping variable.
The DO DATA statement is used for repetitive DO loops
that need to be exited upon the occurrence of an end
of file for an INPUT, READ, or other I/O statement.
This form is common for loops that read data
from either a sequential file or a SAS data set.
When an end of file is reached inside the DO DATA
group, IML immediately jumps from the group and starts
executing the statement following the END statement.
DO DATA groups can be nested, where each end of file
causes a jump from the most local DO DATA group.
The DO DATA loop simulates the
end-of-file behavior of the SAS DATA step.
You should avoid using GOTO and LINK
statements to jump out of a DO DATA group.
Examples of valid statements follow.
The first example inputs the variable NAME from
an external file for the first 100 lines or
until the end of file, whichever occurs first.
do data i=1 to 100;
input name $8.;
end;
Or, if reading from a SAS data set, then the code can be
do data; /* read next obs until eof is reached */
read next var{x}; /* read only variable X */
end;
Copyright © 1999 by SAS Institute Inc., Cary, NC, USA. All rights reserved.
