Date:         Tue, 3 Feb 2004 16:36:51 -0800
Reply-To:     "Choate, Paul@DDS" <pchoate@DDS.CA.GOV>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         "Choate, Paul@DDS" <pchoate@DDS.CA.GOV>
Subject:      Re: Conundrum using Set Point=
Comments: To: "Richard A. DeVenezia" <radevenz@IX.NETCOM.COM>

Richard - Note that if you operate on the id variable the problem
disappears:

(V8.02 PC and MVS)

either
P = rowmap[id+0];
or
id=id;
P = rowmap[id];

and the problem stops.  The variable id is unstable for some reason.  Sounds
like a question for Paul Dorfman.


Paul Choate
DDS Data Extraction
(916) 654-2160

-----Original Message-----
From: Richard A. DeVenezia [mailto:radevenz@IX.NETCOM.COM]
Sent: Tuesday, February 03, 2004 3:14 PM
To: SAS-L@LISTSERV.UGA.EDU
Subject: Conundrum using Set Point=

I've a very strange situation happening in the following program.  The third
assignment to the point= variable is not 'sticking' and is thus causing a
terrific headache.
----------
data ids;
input id;
rownum+1;
cards;
    5
   10
    6
    1
    2
    7
    1
    3
    7
   11
    8
    5
   10
    4
    4
    8
   11
    2
    3
    9
    9
    6
run;

data weird;
  array rowmap [11] _temporary_;
  do while (not eoids);
    set ids end=eoids;
    if mod(rownum,2)=1 then
      rowmap [id] = rownum;
  end;

  P = 1;
  put P=;

  set ids point=P;
  rowmap [ id ] = -rowmap [ id ];
  put rownum= id= rowmap[id]=;

  P + 1;
  put P=;

  set ids point=P;
  put rownum= id= rowmap[id]=;

  P = rowmap[id];
  put P=;

  set ids point=P;
  put rownum= id= rowmap[id]=;

  stop;
run;
----------
LOG
----------
P=1
rownum=1 id=5 rowmap[5]=-1
P=2
rownum=2 id=10 rowmap[10]=13
P=-1
rownum=2 id=10 rowmap[10]=13
eoids=1 id=10 rownum=2 P=-1 _ERROR_=1 _N_=1

-----
Focus on the 4th and 5th lines of the log:
  rownum=2 id=10 rowmap[10]=13
  P=-1
Generated by code
  put rownum= id= rowmap[id]=;
  P = rowmap[id];
  put P=;

rowmap[10] is 13, and is assigned to P, which when put shows -1 !  ( -1 is
value of rowmap[5] ! )


Any clues to what is going on ?

--
Richard A. DeVenezia