topic Re: Do loop Problem in SAS Procedures

Do loop Problem

ariel_fj — Sun, 09 Oct 2011 13:43:47 GMT

What's wrong with my do loop code?

data readsp;
do Method = 'A','B','C';
do Subj = 1 to 10;
input Score @;
output;
end;
end;
datalines;
250 255 256 300 244 268 301 322 256 333
267 275 256 320 250 340 345 290 280 300
1 2 3 4 5 6 7 8 9 0

;

title "List of Speed-reading Methods Test";
proc print data=readsp noobs;
run;

the output can only show these:

Method Subj Score

C         8       8
C         9       9
C        10       0            “

Where are the others?

Do loop Problem

Tom — Sun, 09 Oct 2011 14:00:23 GMT

You do not tell it to goto the next line when it has finished reading the 10 values.

Add an INPUT statement after the inner loop.

data readsp;
do Method = 'A','B','C';
do Subj = 1 to 10;
input Score @;
output;
end;

input;
end;
datalines;
250 255 256 300 244 268 301 322 256 333
267 275 256 320 250 340 345 290 280 300
1 2 3 4 5 6 7 8 9 0

;

Re: Do loop Problem

Ksharp — Mon, 10 Oct 2011 05:58:35 GMT

you should add double @ to prevent point to skip to next line at next data step iteration.

data readsp;
do Method = 'A','B','C';
  do Subj = 1 to 10;
     input Score @@;
     output;
  end;
end;
datalines;
250 255 256 300 244 268 301 322 256 333
267 275 256 320 250 340 345 290 280 300
1 2 3 4 5 6 7 8 9 0
;

title "List of Speed-reading Methods Test";
proc print data=readsp noobs;
run;

Ksharp