3. CONTROL PROGRAM AND DATA PREPARATION


 3.1 Basic Structure of the Card Deck


 The standard program deck which is submitted to the computer for
 processing by LCRAND has the following form.
 (ID and JOB cards)
 1 // EXEC PGM=LCRAND
 2 //STEPLIB DD DSN=A0011225.SEQ1.LCRAND,DISP=0LD
 3 //FT06F001 DD SYSOUT=A
 4 //FT07F001 DD SYSOUT=B
 5 //FTO5F001 DD *
 6 BEGIN
 7 ROWS
 tow data caAdc
 8 END
 9 MATRIX
 matr/ x data c.aWcd
 10 END
 11 RHS
 Alvght hand side data card
12 'iD
13 SOLVE
14 EXIT
15 /*


 The statements numbered 1 through 5 are JCL (Job Control Language)
cards. The user need not be concerned with the details of these state-
ments since they typically do not change from one run to the next.2
Briefly, card 1 instructs the computer to execute a program called LCRAND.
Card 2 defines the data set where the program is to be found. Card 3



 2This JCL will be different at different installations. In particular
the data set name (DSN) for the program data set will probably be different.
In some instances the program may be executed as an object module rather
than a load module. (See Appendix B). A catalogued procedure might exist
which would reduce the number of JCL cards.