Date:         Thu, 17 Oct 2002 10:19:14 +0200
Reply-To:     alte@uni-greifswald.de
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Dietrich Alte <alte@UNI-GREIFSWALD.DE>
Organization: Ernst-Moritz-Arndt-Universität Greifswald
Subject:      Re: X, SYSTEM and CALL SYSTEM compared
Comments: To: diskin.dennis@kendle.com
Comments: cc: Ian Whitlock <WHITLOI1@westat.com>
Content-Type: text/plain; charset="us-ascii"

Yes,
that gives some clarification, thanks to Dennis and Ian.
Although I still wonder, what the difference of SYSTEM and CALL SYSTEM
is.


diskin.dennis@kendle.com wrote:
>
> Dietrich,
>
> Basically, X and call system do the same thing, but from different places.
>
> X is a global command which can be placed anywhere and executes at that
> point. The argument must be a constant literal or possibly a preprocessir
> (macro) expression.
>
> CALL EXECUTE  is a datastep function which executes at run time depending
> on the logic in the datastep. The argument  mmay be built using
> combinations of constants, dataset variables and expressions as with any
> other datastep expression.
>
> HTH,
> Dennis Diskin
>
> From:  Dietrich Alte <alte@UNI-GREIFSWALD.DE>@LISTSERV.UGA.EDU> on
>        10/16/2002 01:31 PM
>
> Please respond to alte@uni-greifswald.de
>
> Sent by:    "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
>
> To:    SAS-L@LISTSERV.UGA.EDU
> cc:
>
> Subject:    X, SYSTEM and CALL SYSTEM compared
>
> Dear folks,
>
> I have been stumbling over these commands.
> Can anybody please supply a short note about (dis-)advantages of
> either choice, or typical cases of use for each? What is their
> difference?
>
> Thanks in advance
>
> --
> -------------------------------------------------------------
>  Dietrich Alte (Statistician, Dipl.-Stat.)
>  - SHIP // Project Management -
>  University of Greifswald - Medical Faculty
>  Institute of Epidemiology and Social Medicine
>  Walther-Rathenau-Str. 48, D-17487 Greifswald, Germany
>  Phone      +49(0)3834-867713, fax ++49(0)3834-866684
>  Email      alte@uni-greifswald.de
>  Institute  http://www.medizin.uni-greifswald.de/epidem/
> -------------------------------------------------------------

--
-------------------------------------------------------------
 Dietrich Alte (Statistician, Dipl.-Stat.)
 - SHIP // Project Management -
 University of Greifswald - Medical Faculty
 Institute of Epidemiology and Social Medicine
 Walther-Rathenau-Str. 48, D-17487 Greifswald, Germany
 Phone      +49(0)3834-867713, fax ++49(0)3834-866684
 Email      alte@uni-greifswald.de
 Institute  http://www.medizin.uni-greifswald.de/epidem/
-------------------------------------------------------------