DNUM Function

Returns the number of members in a directory.

Category:

External Files

Syntax

DNUM(directory-id)

Required Argument

directory-id

is a numeric variable that specifies the identifier that was assigned when the directory was opened by the DOPEN function.

Details

You can use DNUM to determine the highest possible member number that can be passed to DREAD.

Examples

Example 1: Using DNUM to Return the Number of Members

This example opens the directory MYDIR, determines the number of members, and closes the directory:

%let filrf=MYDIR;
%let rc=%sysfunc(filename(filrf,physical-name));
%let did=%sysfunc(dopen(&filrf));
%let memcount=%sysfunc(dnum(&did));
%let rc=%sysfunc(dclose(&did));

Example 2: Using DNUM within a DATA Step

This example creates a DATA step that returns the number of members in a directory called MYDIR:

data _null_;
   rc=filename("mydir","physical-name");
   did=dopen("mydir");
   memcount=dnum(did);
   rc=dclose(did);
run;