SPSS® 12.0 Command Syntax Reference

504 DO REPEAT—END REPEAT
PRINT Subcommand
The PRINT subcommand on END REPEAT displays the commands generated by the DO
REPEAT—END REPEAT structure. PRINT can be used to verify the order in which
commands are executed.
Example
DO REPEAT Q=Q1 TO Q5/ R=R1 TO R5.
COMPUTE Q=0.
COMPUTE R=1.
END REPEAT PRINT.
• The DO REPEAT—END REPEAT structure initializes one set of variables to 0 and another
set to 1.
• The output from the PRINT subcommand is shown in Figure 1. The generated commands
are preceded by plus signs.
• The COMPUTE commands are generated in such a way that variables are created in alternating
order: Q1, R1, Q2, R2, and so forth. If you plan to use the TO keyword to refer to
Q1 to Q5 later, you should use two separate DO REPEAT utilities; otherwise, Q1 to Q5 will
include four of the five R variables. Alternatively, use the NUMERIC command to predetermine
the order in which variables are added to the working file, or specify the replacement
value lists as shown in the next example.
Figure 1 Output from the PRINT subcommand
2 0 DO REPEAT Q=Q1 TO Q5/ R=R1 TO R5
3 0 COMPUTE Q=0
4 0 COMPUTE R=1
5 0 END REPEAT PRINT
6 0 +COMPUTE Q1=0
7 0 +COMPUTE R1=1
8 0 +COMPUTE Q2=0
9 0 +COMPUTE R2=1
10 0 +COMPUTE Q3=0
11 0 +COMPUTE R3=1
12 0 +COMPUTE Q4=0
13 0 +COMPUTE R4=1
14 0 +COMPUTE Q5=0
15 0 +COMPUTE R5=1
Example
DO REPEAT Q=Q1 TO Q5,R1 TO R5/ N=0,0,0,0,0,1,1,1,1,1.
COMPUTE Q=N.
END REPEAT PRINT.
• In this example, a series of constants is specified as a stand-in value list for N. All the Q
variables are initialized first, and then all the R variables, as shown in Figure 2.