Randomly permutes the values of the arguments.

Category: | Combinatorial |

is a numeric variable that contains the random number seed. For more information about seeds, see Seed Values.

specifies all numeric variables or all character variables that have the same length. The values of these variables are randomly permuted.

You can call the RANPERM
routine when you use the %SYSCALL macro. In this case, the variable arguments are not required to be the
same type or length. If %SYSCALL identifies an argument as numeric,
then %SYSCALL reformats the returned value.

The following example
generates random permutations of given values by using the CALL RANPERM
routine.

data _null_; array x x1-x4 (1 2 3 4); seed = 1234567890123; do n=1 to 10; call ranperm(seed, of x1-x4); put seed= @20 ' x= ' x1-x4; end; run;

Output from Using the CALL RANPERM Routine in a DATA Step

seed=1332351321 x= 1 3 2 4 seed=829042065 x= 3 4 2 1 seed=767738639 x= 4 2 3 1 seed=1280236105 x= 1 2 4 3 seed=670350431 x= 2 1 4 3 seed=1956939964 x= 2 4 3 1 seed=353939815 x= 4 1 2 3 seed=1996660805 x= 4 3 1 2 seed=1835940555 x= 4 3 2 1 seed=910897519 x= 3 2 1 4

%macro test; %let x1=ant; %let x2=-.1234; %let x3=1e10; %let x4=hippopotamus; %let x5=zebra; %let seed = 12345; %do j=1 %to 10; %syscall ranperm(seed, x1, x2, x3, x4, x5); %put j=&j &x1 &x2 &x3; %end; %mend; %test;

Output from Using the CALL RANPERM Routine with a Macro

j=1 zebra ant hippopotamus j=2 10000000000 ant -0.1234 j=3 -0.1234 10000000000 ant j=4 hippopotamus ant zebra j=5 -0.1234 zebra 10000000000 j=6 -0.1234 hippopotamus ant j=7 zebra ant -0.1234 j=8 -0.1234 hippopotamus ant j=9 ant -0.1234 hippopotamus j=10 -0.1234 zebra 10000000000

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