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Thanks
-----Original Message-----
From: SAS(r) Discussion [mailto:SAS-L@LISTSERV.UGA.EDU]On Behalf Of
Richard A. DeVenezia
Sent: Monday, June 20, 2005 7:00 PM
To: SAS-L@LISTSERV.UGA.EDU
Subject: Re: Macro Question (reformulated)
Sharma, Diwakar (GE Equipment Services, consultant) wrote:
> Hi,
>
> This is just a clarification. Whats the meaning of "wallpaper code" ??
Diwakar:
Wallpaper in the home is a wall covering having a pattern that repeats over
and over. Also known as a tessellation.
Wallpaper code is a series of identically structured statements that repeat
over and over, with small variations in each statement. When printouts of
wallpaper code are tacked to a wall, they cover it like wallpaper.
This is wallpaper code,
if name = 'A' then output A; else
if name = 'B' then output B; else
if name = 'C' then output C; else
if name = 'D' then output D; else
if name = 'E' then output E; else
if name = 'F' then output F; else
if name = 'G' then output G; else
if name = 'H' then output H; else
if name = 'I' then output I; else
if name = 'J' then output J; else
if name = 'K' then output K; else
if name = 'L' then output L; else
if name = 'M' then output M; else
if name = 'N' then output N; else
if name = 'O' then output O; else
if name = 'P' then output P; else
if name = 'Q' then output Q; else
if name = 'R' then output R; else
if name = 'S' then output S; else
if name = 'T' then output T; else
if name = 'U' then output U; else
if name = 'V' then output V; else
if name = 'W' then output W; else
if name = 'X' then output X; else
if name = 'Y' then output Y; else
if name = 'Z' then output Z; else
;
Attempts to edit wallpaper code are prone to typographic error. There is
usually an underlying methodology that drives the need for 'wallpaper code',
and the method can be functionally decomposed (i.e. finding the rules for
the variations within the repetitions {patterning rule, or simple the
rules}). When that is the case, it is more reliable to write a program that
writes the code {using the rules} for where wallpaper processing is too
occur.
Examine the above wallpaper again:
%* this macro snippet creates 26 if then else statements
%do x = 1 %to 26;
%let letter = %sysfunc(byte(&x));
if name = "&letter." then output &letter.; else
%end;
;
Richard A. DeVenezia
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