Hi all,
I would like to concatenate multiple subject IDs that looks like this:
S002001~S002002, S002006~S002012, S002014~S002016
so basically, I would like to connect the subjid's that are continuous with "~" and use "," for those that is not continuous..
here's the data:
data a;
input subjid $8.;
cards;
S002001
S002002
S002006
S002007
S002008
S002009
S002010
S002011
S002012
S002014
S002015
S002016
;
run;
Thanks in advance for your help!
I think the easiest way is to start with creating a group variable:
Data grouped;
set a;
_number=input(substr(subjid,2),6.);
if dif(_number) ne 1 then
group+1;
drop _number;
run;
Then you can use CATX to create the string:
Data want;
set grouped end=done;
by group;
length Sequences $200;
retain Sequences;
if first.group then
call catx(', ',Sequences,subjid);
else if last.group then
call catx('~',Sequences,subjid);
if done;
keep Sequences;
run;
Are all your values prefixed by "S"?
Do you want that list in saved in a dataset-variable? Can you describe what the next steps are?
I think the easiest way is to start with creating a group variable:
Data grouped;
set a;
_number=input(substr(subjid,2),6.);
if dif(_number) ne 1 then
group+1;
drop _number;
run;
Then you can use CATX to create the string:
Data want;
set grouped end=done;
by group;
length Sequences $200;
retain Sequences;
if first.group then
call catx(', ',Sequences,subjid);
else if last.group then
call catx('~',Sequences,subjid);
if done;
keep Sequences;
run;
Yess! This will do. Thanks so much for your help!
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